Freezer: make kernel threads nonfreezable by default

83144186 · Rafael J. Wysocki <[email protected]> · 2007-07-17 04:03:35 -07:00

Currently, the freezer treats all tasks as freezable, except for the kernel
threads that explicitly set the PF_NOFREEZE flag for themselves.  This
approach is problematic, since it requires every kernel thread to either
set PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn't
care for the freezing of tasks at all.

It seems better to only require the kernel threads that want to or need to
be frozen to use some freezer-related code and to remove any
freezer-related code from the other (nonfreezable) kernel threads, which is
done in this patch.

The patch causes all kernel threads to be nonfreezable by default (ie.  to
have PF_NOFREEZE set by default) and introduces the set_freezable()
function that should be called by the freezable kernel threads in order to
unset PF_NOFREEZE.  It also makes all of the currently freezable kernel
threads call set_freezable(), so it shouldn't cause any (intentional)
change of behaviour to appear.  Additionally, it updates documentation to
describe the freezing of tasks more accurately.

[[email protected]: build fixes]
Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Nigel Cunningham <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Gautham R Shenoy <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 831441862956fffa17b9801db37e6ea1650b0f69
Parents: 787d2214

Changes

65 files changed · +256 −113

File	Status	Add	Del	Content
Documentation/power/freezing-of-tasks.txt	added	+160	−0	View file
Documentation/power/kernel_threads.txt	deleted	+0	−40	View before deletion
Documentation/power/swsusp.txt	modified	+4	−14	View file
arch/i386/kernel/apm.c	modified	+1	−1	View file
arch/i386/kernel/io_apic.c	modified	+1	−0	View file
drivers/block/loop.c	modified	+1	−7	View file
drivers/block/pktcdvd.c	modified	+1	−0	View file
drivers/char/apm-emulation.c	modified	+1	−11	View file
drivers/char/hvc_console.c	modified	+1	−0	View file
drivers/edac/edac_mc.c	modified	+1	−0	View file
drivers/ieee1394/ieee1394_core.c	modified	+1	−2	View file
drivers/ieee1394/nodemgr.c	modified	+1	−0	View file
drivers/input/gameport/gameport.c	modified	+1	−0	View file
drivers/input/serio/serio.c	modified	+1	−0	View file
drivers/input/touchscreen/ucb1400_ts.c	modified	+1	−0	View file
drivers/macintosh/therm_adt746x.c	modified	+1	−0	View file
drivers/macintosh/windfarm_core.c	modified	+1	−0	View file
drivers/md/md.c	modified	+0	−1	View file
drivers/media/dvb/dvb-core/dvb_frontend.c	modified	+1	−0	View file
drivers/media/video/cx88/cx88-tvaudio.c	modified	+1	−0	View file
drivers/media/video/msp3400-kthreads.c	modified	+4	−2	View file
drivers/media/video/tvaudio.c	modified	+1	−1	View file
drivers/media/video/video-buf-dvb.c	modified	+1	−0	View file
drivers/media/video/vivi.c	modified	+1	−0	View file
drivers/mfd/ucb1x00-ts.c	modified	+1	−0	View file
drivers/mmc/card/queue.c	modified	+2	−5	View file
drivers/mtd/mtd_blkdevs.c	modified	+2	−1	View file
drivers/mtd/ubi/wl.c	modified	+1	−0	View file
drivers/net/wireless/airo.c	modified	+2	−1	View file
drivers/net/wireless/libertas/main.c	modified	+1	−0	View file
drivers/pcmcia/cs.c	modified	+1	−0	View file
drivers/pnp/pnpbios/core.c	modified	+1	−0	View file
drivers/scsi/libsas/sas_scsi_host.c	modified	+1	−2	View file
drivers/scsi/scsi_error.c	modified	+1	−2	View file
drivers/usb/atm/ueagle-atm.c	modified	+1	−0	View file
drivers/usb/core/hub.c	modified	+1	−0	View file
drivers/usb/gadget/file_storage.c	modified	+3	−0	View file
drivers/usb/storage/usb.c	modified	+1	−2	View file
drivers/video/ps3fb.c	modified	+1	−0	View file
drivers/w1/w1.c	modified	+1	−0	View file
fs/cifs/cifsfs.c	modified	+1	−0	View file
fs/cifs/connect.c	modified	+1	−0	View file
fs/jffs2/background.c	modified	+1	−0	View file
fs/lockd/svc.c	modified	+2	−0	View file
fs/nfs/callback.c	modified	+2	−0	View file
fs/nfsd/nfssvc.c	modified	+2	−0	View file
fs/xfs/linux-2.6/xfs_super.c	modified	+1	−0	View file
include/linux/freezer.h	modified	+14	−0	View file
init/do_mounts_initrd.c	modified	+2	−5	View file
kernel/audit.c	modified	+1	−0	View file
kernel/exit.c	modified	+6	−0	View file
kernel/fork.c	modified	+1	−1	View file
kernel/rcutorture.c	modified	+1	−3	View file
kernel/rtmutex-tester.c	modified	+1	−0	View file
kernel/sched.c	modified	+0	−3	View file
kernel/softirq.c	modified	+1	−2	View file
kernel/softlockup.c	modified	+1	−1	View file
kernel/workqueue.c	modified	+2	−2	View file
mm/pdflush.c	modified	+1	−0	View file
mm/vmscan.c	modified	+1	−0	View file
net/bluetooth/bnep/core.c	modified	+1	−1	View file
net/bluetooth/cmtp/core.c	modified	+1	−1	View file
net/bluetooth/hidp/core.c	modified	+1	−1	View file
net/bluetooth/rfcomm/core.c	modified	+1	−1	View file
net/core/pktgen.c	modified	+2	−0	View file

Only the first 600 diff lines are shown. Download the complete patch.

Documentation/power/freezing-of-tasks.txt

View file

diff --git a/Documentation/power/freezing-of-tasks.txt b/Documentation/power/freezing-of-tasks.txt
new file mode 100644
index 0000000..af1a282
--- /dev/null
+++ b/Documentation/power/freezing-of-tasks.txt
@@ -0,0 +1,160 @@
+Freezing of tasks
+	(C) 2007 Rafael J. Wysocki <[email protected]>, GPL
+
+I. What is the freezing of tasks?
+
+The freezing of tasks is a mechanism by which user space processes and some
+kernel threads are controlled during hibernation or system-wide suspend (on some
+architectures).
+
+II. How does it work?
+
+There are four per-task flags used for that, PF_NOFREEZE, PF_FROZEN, TIF_FREEZE
+and PF_FREEZER_SKIP (the last one is auxiliary).  The tasks that have
+PF_NOFREEZE unset (all user space processes and some kernel threads) are
+regarded as 'freezable' and treated in a special way before the system enters a
+suspend state as well as before a hibernation image is created (in what follows
+we only consider hibernation, but the description also applies to suspend).
+
+Namely, as the first step of the hibernation procedure the function
+freeze_processes() (defined in kernel/power/process.c) is called.  It executes
+try_to_freeze_tasks() that sets TIF_FREEZE for all of the freezable tasks and
+sends a fake signal to each of them.  A task that receives such a signal and has
+TIF_FREEZE set, should react to it by calling the refrigerator() function
+(defined in kernel/power/process.c), which sets the task's PF_FROZEN flag,
+changes its state to TASK_UNINTERRUPTIBLE and makes it loop until PF_FROZEN is
+cleared for it.  Then, we say that the task is 'frozen' and therefore the set of
+functions handling this mechanism is called 'the freezer' (these functions are
+defined in kernel/power/process.c and include/linux/freezer.h).  User space
+processes are generally frozen before kernel threads.
+
+It is not recommended to call refrigerator() directly.  Instead, it is
+recommended to use the try_to_freeze() function (defined in
+include/linux/freezer.h), that checks the task's TIF_FREEZE flag and makes the
+task enter refrigerator() if the flag is set.
+
+For user space processes try_to_freeze() is called automatically from the
+signal-handling code, but the freezable kernel threads need to call it
+explicitly in suitable places.  The code to do this may look like the following:
+
+	do {
+		hub_events();
+		wait_event_interruptible(khubd_wait,
+					!list_empty(&hub_event_list));
+		try_to_freeze();
+	} while (!signal_pending(current));
+
+(from drivers/usb/core/hub.c::hub_thread()).
+
+If a freezable kernel thread fails to call try_to_freeze() after the freezer has
+set TIF_FREEZE for it, the freezing of tasks will fail and the entire
+hibernation operation will be cancelled.  For this reason, freezable kernel
+threads must call try_to_freeze() somewhere.
+
+After the system memory state has been restored from a hibernation image and
+devices have been reinitialized, the function thaw_processes() is called in
+order to clear the PF_FROZEN flag for each frozen task.  Then, the tasks that
+have been frozen leave refrigerator() and continue running.
+
+III. Which kernel threads are freezable?
+
+Kernel threads are not freezable by default.  However, a kernel thread may clear
+PF_NOFREEZE for itself by calling set_freezable() (the resetting of PF_NOFREEZE
+directly is strongly discouraged).  From this point it is regarded as freezable
+and must call try_to_freeze() in a suitable place.
+
+IV. Why do we do that?
+
+Generally speaking, there is a couple of reasons to use the freezing of tasks:
+
+1. The principal reason is to prevent filesystems from being damaged after
+hibernation.  At the moment we have no simple means of checkpointing
+filesystems, so if there are any modifications made to filesystem data and/or
+metadata on disks, we cannot bring them back to the state from before the
+modifications.  At the same time each hibernation image contains some
+filesystem-related information that must be consistent with the state of the
+on-disk data and metadata after the system memory state has been restored from
+the image (otherwise the filesystems will be damaged in a nasty way, usually
+making them almost impossible to repair).  We therefore freeze tasks that might
+cause the on-disk filesystems' data and metadata to be modified after the
+hibernation image has been created and before the system is finally powered off.
+The majority of these are user space processes, but if any of the kernel threads
+may cause something like this to happen, they have to be freezable.
+
+2. The second reason is to prevent user space processes and some kernel threads
+from interfering with the suspending and resuming of devices.  A user space
+process running on a second CPU while we are suspending devices may, for
+example, be troublesome and without the freezing of tasks we would need some
+safeguards against race conditions that might occur in such a case.
+
+Although Linus Torvalds doesn't like the freezing of tasks, he said this in one
+of the discussions on LKML (http://lkml.org/lkml/2007/4/27/608):
+
+"RJW:> Why we freeze tasks at all or why we freeze kernel threads?
+
+Linus: In many ways, 'at all'.
+
+I _do_ realize the IO request queue issues, and that we cannot actually do
+s2ram with some devices in the middle of a DMA.  So we want to be able to
+avoid *that*, there's no question about that.  And I suspect that stopping
+user threads and then waiting for a sync is practically one of the easier
+ways to do so.
+
+So in practice, the 'at all' may become a 'why freeze kernel threads?' and
+freezing user threads I don't find really objectionable."
+
+Still, there are kernel threads that may want to be freezable.  For example, if
+a kernel that belongs to a device driver accesses the device directly, it in
+principle needs to know when the device is suspended, so that it doesn't try to
+access it at that time.  However, if the kernel thread is freezable, it will be
+frozen before the driver's .suspend() callback is executed and it will be
+thawed after the driver's .resume() callback has run, so it won't be accessing
+the device while it's suspended.
+
+3. Another reason for freezing tasks is to prevent user space processes from
+realizing that hibernation (or suspend) operation takes place.  Ideally, user
+space processes should not notice that such a system-wide operation has occurred
+and should continue running without any problems after the restore (or resume
+from suspend).  Unfortunately, in the most general case this is quite difficult
+to achieve without the freezing of tasks.  Consider, for example, a process
+that depends on all CPUs being online while it's running.  Since we need to
+disable nonboot CPUs during the hibernation, if this process is not frozen, it
+may notice that the number of CPUs has changed and may start to work incorrectly
+because of that.
+
+V. Are there any problems related to the freezing of tasks?
+
+Yes, there are.
+
+First of all, the freezing of kernel threads may be tricky if they depend one
+on another.  For example, if kernel thread A waits for a completion (in the
+TASK_UNINTERRUPTIBLE state) that needs to be done by freezable kernel thread B
+and B is frozen in the meantime, then A will be blocked until B is thawed, which
+may be undesirable.  That's why kernel threads are not freezable by default.
+
+Second, there are the following two problems related to the freezing of user
+space processes:
+1. Putting processes into an uninterruptible sleep distorts the load average.
+2. Now that we have FUSE, plus the framework for doing device drivers in
+userspace, it gets even more complicated because some userspace processes are
+now doing the sorts of things that kernel threads do
+(https://lists.linux-foundation.org/pipermail/linux-pm/2007-May/012309.html).
+
+The problem 1. seems to be fixable, although it hasn't been fixed so far.  The
+other one is more serious, but it seems that we can work around it by using
+hibernation (and suspend) notifiers (in that case, though, we won't be able to
+avoid the realization by the user space processes that the hibernation is taking
+place).
+
+There are also problems that the freezing of tasks tends to expose, although
+they are not directly related to it.  For example, if request_firmware() is
+called from a device driver's .resume() routine, it will timeout and eventually
+fail, because the user land process that should respond to the request is frozen
+at this point.  So, seemingly, the failure is due to the freezing of tasks.
+Suppose, however, that the firmware file is located on a filesystem accessible
+only through another device that hasn't been resumed yet.  In that case,
+request_firmware() will fail regardless of whether or not the freezing of tasks
+is used.  Consequently, the problem is not really related to the freezing of
+tasks, since it generally exists anyway.  [The solution to this particular
+problem is to keep the firmware in memory after it's loaded for the first time
+and upload if from memory to the device whenever necessary.]

Documentation/power/kernel_threads.txt

View before deletion

diff --git a/Documentation/power/kernel_threads.txt b/Documentation/power/kernel_threads.txt
deleted file mode 100644
index fb57784..0000000
--- a/Documentation/power/kernel_threads.txt
+++ /dev/null
@@ -1,40 +0,0 @@
-KERNEL THREADS
-
-
-Freezer
-
-Upon entering a suspended state the system will freeze all
-tasks. This is done by delivering pseudosignals. This affects
-kernel threads, too. To successfully freeze a kernel thread
-the thread has to check for the pseudosignal and enter the
-refrigerator. Code to do this looks like this:
-
-	do {
-		hub_events();
-		wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
-		try_to_freeze();
-	} while (!signal_pending(current));
-
-from drivers/usb/core/hub.c::hub_thread()
-
-
-The Unfreezable
-
-Some kernel threads however, must not be frozen. The kernel must
-be able to finish pending IO operations and later on be able to
-write the memory image to disk. Kernel threads needed to do IO
-must stay awake. Such threads must mark themselves unfreezable
-like this:
-
-	/*
-	 * This thread doesn't need any user-level access,
-	 * so get rid of all our resources.
-	 */
-	daemonize("usb-storage");
-
-	current->flags |= PF_NOFREEZE;
-
-from drivers/usb/storage/usb.c::usb_stor_control_thread()
-
-Such drivers are themselves responsible for staying quiet during
-the actual snapshotting.

Documentation/power/swsusp.txt

View file

diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 152b510..aea7e92 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -140,21 +140,11 @@ should be sent to the mailing list available through the suspend2
 website, and not to the Linux Kernel Mailing List. We are working
 toward merging suspend2 into the mainline kernel.
 
-Q: A kernel thread must voluntarily freeze itself (call 'refrigerator').
-I found some kernel threads that don't do it, and they don't freeze
-so the system can't sleep. Is this a known behavior?
-
-A: All such kernel threads need to be fixed, one by one. Select the
-place where the thread is safe to be frozen (no kernel semaphores
-should be held at that point and it must be safe to sleep there), and
-add:
-
-       try_to_freeze();
-
-If the thread is needed for writing the image to storage, you should
-instead set the PF_NOFREEZE process flag when creating the thread (and
-be very careful).
+Q: What is the freezing of tasks and why are we using it?
 
+A: The freezing of tasks is a mechanism by which user space processes and some
+kernel threads are controlled during hibernation or system-wide suspend (on some
+architectures).  See freezing-of-tasks.txt for details.
 
 Q: What is the difference between "platform" and "shutdown"?
 

arch/i386/kernel/apm.c

View file

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index 4112afe..47001d5 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -222,6 +222,7 @@
 #include <linux/capability.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
+#include <linux/freezer.h>
 #include <linux/smp.h>
 #include <linux/dmi.h>
 #include <linux/suspend.h>
@@ -2311,7 +2312,6 @@ static int __init apm_init(void)
 		remove_proc_entry("apm", NULL);
 		return err;
 	}
-	kapmd_task->flags |= PF_NOFREEZE;
 	wake_up_process(kapmd_task);
 
 	if (num_online_cpus() > 1 && !smp ) {

arch/i386/kernel/io_apic.c

View file

diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 7f8b7af..21db8f5 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -667,6 +667,7 @@ static int balanced_irq(void *unused)
 		set_pending_irq(i, cpumask_of_cpu(0));
 	}
 
+	set_freezable();
 	for ( ; ; ) {
 		time_remaining = schedule_timeout_interruptible(time_remaining);
 		try_to_freeze();

drivers/block/loop.c

View file

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 4503290..06eaa11 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -68,6 +68,7 @@
 #include <linux/loop.h>
 #include <linux/compat.h>
 #include <linux/suspend.h>
+#include <linux/freezer.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>		/* for invalidate_bdev() */
 #include <linux/completion.h>
@@ -600,13 +601,6 @@ static int loop_thread(void *data)
 	struct loop_device *lo = data;
 	struct bio *bio;
 
-	/*
-	 * loop can be used in an encrypted device,
-	 * hence, it mustn't be stopped at all
-	 * because it could be indirectly used during suspension
-	 */
-	current->flags |= PF_NOFREEZE;
-
 	set_user_nice(current, -20);
 
 	while (!kthread_should_stop() || lo->lo_bio) {

drivers/block/pktcdvd.c

View file

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 7c294a4..31be33e 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1593,6 +1593,7 @@ static int kcdrwd(void *foobar)
 	long min_sleep_time, residue;
 
 	set_user_nice(current, -20);
+	set_freezable();
 
 	for (;;) {
 		DECLARE_WAITQUEUE(wait, current);

drivers/char/apm-emulation.c

View file

diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index 179c7a3..ec116df 100644
--- a/drivers/char/apm-emulation.c
+++ b/drivers/char/apm-emulation.c
@@ -20,6 +20,7 @@
 #include <linux/sched.h>
 #include <linux/pm.h>
 #include <linux/apm-emulation.h>
+#include <linux/freezer.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
@@ -329,13 +330,8 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
 			/*
 			 * Wait for the suspend/resume to complete.  If there
 			 * are pending acknowledges, we wait here for them.
-			 *
-			 * Note: we need to ensure that the PM subsystem does
-			 * not kick us out of the wait when it suspends the
-			 * threads.
 			 */
 			flags = current->flags;
-			current->flags |= PF_NOFREEZE;
 
 			wait_event(apm_suspend_waitqueue,
 				   as->suspend_state == SUSPEND_DONE);
@@ -365,13 +361,8 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
 			/*
 			 * Wait for the suspend/resume to complete.  If there
 			 * are pending acknowledges, we wait here for them.
-			 *
-			 * Note: we need to ensure that the PM subsystem does
-			 * not kick us out of the wait when it suspends the
-			 * threads.
 			 */
 			flags = current->flags;
-			current->flags |= PF_NOFREEZE;
 
 			wait_event_interruptible(apm_suspend_waitqueue,
 					 as->suspend_state == SUSPEND_DONE);
@@ -598,7 +589,6 @@ static int __init apm_init(void)
 		kapmd_tsk = NULL;
 		return ret;
 	}
-	kapmd_tsk->flags |= PF_NOFREEZE;
 	wake_up_process(kapmd_tsk);
 
 #ifdef CONFIG_PROC_FS

drivers/char/hvc_console.c

View file

diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index b3ab42e..83c1151 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -679,6 +679,7 @@ static int khvcd(void *unused)
 	int poll_mask;
 	struct hvc_struct *hp;
 
+	set_freezable();
 	__set_current_state(TASK_RUNNING);
 	do {
 		poll_mask = 0;

drivers/edac/edac_mc.c

View file

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 7b62230..804875d 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -1906,6 +1906,7 @@ static void do_edac_check(void)
 
 static int edac_kernel_thread(void *arg)
 {
+	set_freezable();
 	while (!kthread_should_stop()) {
 		do_edac_check();
 

drivers/ieee1394/ieee1394_core.c

View file

diff --git a/drivers/ieee1394/ieee1394_core.c b/drivers/ieee1394/ieee1394_core.c
index 0fc8c6e..ee45259 100644
--- a/drivers/ieee1394/ieee1394_core.c
+++ b/drivers/ieee1394/ieee1394_core.c
@@ -30,6 +30,7 @@
 #include <linux/moduleparam.h>
 #include <linux/bitops.h>
 #include <linux/kdev_t.h>
+#include <linux/freezer.h>
 #include <linux/suspend.h>
 #include <linux/kthread.h>
 #include <linux/preempt.h>
@@ -1128,8 +1129,6 @@ static int hpsbpkt_thread(void *__hi)
 	struct list_head tmp;
 	int may_schedule;
 
-	current->flags |= PF_NOFREEZE;
-
 	while (!kthread_should_stop()) {
 
 		INIT_LIST_HEAD(&tmp);

drivers/ieee1394/nodemgr.c

View file

diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 51a1206..2ffd534 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -1699,6 +1699,7 @@ static int nodemgr_host_thread(void *__hi)
 	unsigned int g, generation = 0;
 	int i, reset_cycles = 0;
 
+	set_freezable();
 	/* Setup our device-model entries */
 	nodemgr_create_host_dev_files(host);
 

drivers/input/gameport/gameport.c

View file

diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index bd686a2..20896d5 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -445,6 +445,7 @@ static struct gameport *gameport_get_pending_child(struct gameport *parent)
 
 static int gameport_thread(void *nothing)
 {
+	set_freezable();
 	do {
 		gameport_handle_event();
 		wait_event_interruptible(gameport_wait,

drivers/input/serio/serio.c

View file

diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index a8f3bc1..372ca49 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -384,6 +384,7 @@ static struct serio *serio_get_pending_child(struct serio *parent)
 
 static int serio_thread(void *nothing)
 {
+	set_freezable();
 	do {
 		serio_handle_event();
 		wait_event_interruptible(serio_wait,

drivers/input/touchscreen/ucb1400_ts.c

View file

diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index f0cbcdb..36f9440 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -292,6 +292,7 @@ static int ucb1400_ts_thread(void *_ucb)
 
 	sched_setscheduler(tsk, SCHED_FIFO, &param);
 
+	set_freezable();
 	while (!kthread_should_stop()) {
 		unsigned int x, y, p;
 		long timeout;

drivers/macintosh/therm_adt746x.c

View file

diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index bd55e6a..f25685b 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -335,6 +335,7 @@ static int monitor_task(void *arg)
 {
 	struct thermostat* th = arg;
 
+	set_freezable();
 	while(!kthread_should_stop()) {
 		try_to_freeze();
 		msleep_interruptible(2000);

drivers/macintosh/windfarm_core.c

View file

diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c
index 4fcb245..e18d265 100644
--- a/drivers/macintosh/windfarm_core.c
+++ b/drivers/macintosh/windfarm_core.c
@@ -92,6 +92,7 @@ static int wf_thread_func(void *data)
 
 	DBG("wf: thread started\n");
 
+	set_freezable();
 	while(!kthread_should_stop()) {
 		if (time_after_eq(jiffies, next)) {
 			wf_notify(WF_EVENT_TICK, NULL);

drivers/md/md.c

View file

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 33beaa7..9aefc4a 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4642,7 +4642,6 @@ static int md_thread(void * arg)
 	 * many dirty RAID5 blocks.
 	 */
 
-	current->flags |= PF_NOFREEZE;
 	allow_signal(SIGKILL);
 	while (!kthread_should_stop()) {
 

drivers/media/dvb/dvb-core/dvb_frontend.c

View file

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index f4e4ca2..b6c7f66 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -523,6 +523,7 @@ static int dvb_frontend_thread(void *data)
 
 	dvb_frontend_init(fe);
 
+	set_freezable();
 	while (1) {
 		up(&fepriv->sem);	    /* is locked when we enter the thread... */
 restart:

drivers/media/video/cx88/cx88-tvaudio.c

View file

diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c
index 259ea08..1cc2d28 100644
--- a/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/drivers/media/video/cx88/cx88-tvaudio.c
@@ -906,6 +906,7 @@ int cx88_audio_thread(void *data)
 	u32 mode = 0;
 
 	dprintk("cx88: tvaudio thread started\n");
+	set_freezable();
 	for (;;) {
 		msleep_interruptible(1000);
 		if (kthread_should_stop())

drivers/media/video/msp3400-kthreads.c

View file

diff --git a/drivers/media/video/msp3400-kthreads.c b/drivers/media/video/msp3400-kthreads.c
index e1821eb..d5ee262 100644
--- a/drivers/media/video/msp3400-kthreads.c
+++ b/drivers/media/video/msp3400-kthreads.c
@@ -23,6 +23,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
+#include <linux/freezer.h>
 #include <linux/videodev.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-common.h>
@@ -468,6 +469,7 @@ int msp3400c_thread(void *data)
 
 
 	v4l_dbg(1, msp_debug, client, "msp3400 daemon started\n");
+	set_freezable();
 	for (;;) {
 		v4l_dbg(2, msp_debug, client, "msp3400 thread: sleep\n");
 		msp_sleep(state, -1);
@@ -646,7 +648,7 @@ int msp3410d_thread(void *data)
 	int val, i, std, count;
 
 	v4l_dbg(1, msp_debug, client, "msp3410 daemon started\n");
-
+	set_freezable();
 	for (;;) {
 		v4l_dbg(2, msp_debug, client, "msp3410 thread: sleep\n");
 		msp_sleep(state,-1);
@@ -940,7 +942,7 @@ int msp34xxg_thread(void *data)
 	int val, i;
 
 	v4l_dbg(1, msp_debug, client, "msp34xxg daemon started\n");
-
+	set_freezable();
 	for (;;) {
 		v4l_dbg(2, msp_debug, client, "msp34xxg thread: sleep\n");
 		msp_sleep(state, -1);

drivers/media/video/tvaudio.c

View file

diff --git a/drivers/media/video/tvaudio.c b/drivers/media/video/tvaudio.c
index c9bf9db..9da338d 100644
--- a/drivers/media/video/tvaudio.c
+++ b/drivers/media/video/tvaudio.c
@@ -271,7 +271,7 @@ static int chip_thread(void *data)
 	struct CHIPDESC  *desc = chiplist + chip->type;
 
 	v4l_dbg(1, debug, &chip->c, "%s: thread started\n", chip->c.name);
-
+	set_freezable();
 	for (;;) {
 		set_current_state(TASK_INTERRUPTIBLE);
 		if (!kthread_should_stop())

drivers/media/video/video-buf-dvb.c

View file

diff --git a/drivers/media/video/video-buf-dvb.c b/drivers/media/video/video-buf-dvb.c
index fcc5467..e617925 100644
--- a/drivers/media/video/video-buf-dvb.c
+++ b/drivers/media/video/video-buf-dvb.c
@@ -47,6 +47,7 @@ static int videobuf_dvb_thread(void *data)
 	int err;
 
 	dprintk("dvb thread started\n");
+	set_freezable();
 	videobuf_read_start(&dvb->dvbq);
 
 	for (;;) {

drivers/media/video/vivi.c

View file

diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index f7e1d19..3ef4d01 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -573,6 +573,7 @@ static int vivi_thread(void *data)
 	dprintk(1,"thread started\n");
 
 	mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
+	set_freezable();
 
 	for (;;) {
 		vivi_sleep(dma_q);

drivers/mfd/ucb1x00-ts.c

View file

diff --git a/drivers/mfd/ucb1x00-ts.c b/drivers/mfd/ucb1x00-ts.c
index 38e815a..fdbaa77 100644
--- a/drivers/mfd/ucb1x00-ts.c
+++ b/drivers/mfd/ucb1x00-ts.c
@@ -209,6 +209,7 @@ static int ucb1x00_thread(void *_ts)
 	DECLARE_WAITQUEUE(wait, tsk);
 	int valid = 0;
 
+	set_freezable();
 	add_wait_queue(&ts->irq_wait, &wait);
 	while (!kthread_should_stop()) {
 		unsigned int x, y, p;