linux-toradex.git/kernel/power/user.c, branch v2.6.38-rc5

PM / Hibernate: Fix PM_POST_* notification with user-space suspend

2010-12-16T16:08:43+00:00

The user-space hibernation sends a wrong notification after the image
restoration because of thinko for the file flag check.  RDONLY
corresponds to hibernation and WRONLY to restoration, confusingly.

Signed-off-by: Takashi Iwai 
Signed-off-by: Rafael J. Wysocki 
Cc: stable@kernel.org

PM / Hibernate: Fix memory corruption related to swap

2010-12-06T22:52:08+00:00

There is a problem that swap pages allocated before the creation of
a hibernation image can be released and used for storing the contents
of different memory pages while the image is being saved.  Since the
kernel stored in the image doesn't know of that, it causes memory
corruption to occur after resume from hibernation, especially on
systems with relatively small RAM that need to swap often.

This issue can be addressed by keeping the GFP_IOFS bits clear
in gfp_allowed_mask during the entire hibernation, including the
saving of the image, until the system is finally turned off or
the hibernation is aborted.  Unfortunately, for this purpose
it's necessary to rework the way in which the hibernate and
suspend code manipulates gfp_allowed_mask.

This change is based on an earlier patch from Hugh Dickins.

Signed-off-by: Rafael J. Wysocki 
Reported-by: Ondrej Zary 
Acked-by: Hugh Dickins 
Reviewed-by: KAMEZAWA Hiroyuki 
Cc: stable@kernel.org

PM / Hibernate: Snapshot cleanup

2010-05-10T21:08:17+00:00

Remove support of reads with offset. This means snapshot_read/write_next
now does not accept count parameter. It allows to clean up the functions
and snapshot handle which no longer needs to care about offsets.

/dev/snapshot handler is converted to simple_{read_from,write_to}_buffer
which take care of offsets.

Signed-off-by: Jiri Slaby 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: user.c, fix SNAPSHOT_SET_SWAP_AREA handling

2010-04-10T20:28:56+00:00

When CONFIG_DEBUG_BLOCK_EXT_DEVT is set we decode the device
improperly by old_decode_dev and it results in an error while
hibernating with s2disk.

All users already pass the new device number, so switch to
new_decode_dev().

Signed-off-by: Jiri Slaby 
Reported-and-tested-by: Jiri Kosina 
Signed-off-by: "Rafael J. Wysocki"

PM / Hibernate: Really deprecate deprecated user ioctls

2010-02-26T19:39:11+00:00

They were deprecated and removed from exported headers more than 2
years ago. Inform users about their removal in the future now.

(Switch cases needed to be reorderded for an easy fall through.)

And add an entry to feature-removal-schedule.

Signed-off-by: Jiri Slaby 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki

headers: smp_lock.h redux

2009-07-12T19:22:34+00:00

* Remove smp_lock.h from files which don't need it (including some headers!)
* Add smp_lock.h to files which do need it
* Make smp_lock.h include conditional in hardirq.h
  It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT

  This will make hardirq.h inclusion cheaper for every PREEMPT=n config
  (which includes allmodconfig/allyesconfig, BTW)

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Linus Torvalds

PM/Hibernate: Wait for SCSI devices scan to complete during resume

2009-04-13T18:37:07+00:00

There is a race between resume from hibernation and the asynchronous
scanning of SCSI devices and to prevent it from happening we need to
call scsi_complete_async_scans() during resume from hibernation.

In addition, if the resume from hibernation is userland-driven, it's
better to wait for all device probes in the kernel to complete before
attempting to open the resume device.

Signed-off-by: Rafael J. Wysocki 
Acked-by: Arjan van de Ven 
Signed-off-by: Linus Torvalds

PM: Fix pm_notifiers during user mode hibernation

2009-02-21T22:17:17+00:00

Snapshot device is opened with O_RDONLY during suspend and O_WRONLY durig
resume.  Make sure we also call notifiers with correct parameter telling
them what we are really doing.

Signed-off-by: Andrey Borzenkov 
Signed-off-by: Rafael J. Wysocki 
Cc: Len Brown 
Cc: Greg KH 
Acked-by: Pavel Machek 
Signed-off-by: Linus Torvalds

pm: rework disabling of user mode helpers during suspend/hibernation

2008-10-16T18:21:29+00:00

We currently use a PM notifier to disable user mode helpers before suspend
and hibernation and to re-enable them during resume.  However, this is not
an ideal solution, because if any drivers want to upload firmware into
memory before suspend, they have to use a PM notifier for this purpose and
there is no guarantee that the ordering of PM notifiers will be as
expected (ie.  the notifier that disables user mode helpers has to be run
after the driver's notifier used for uploading the firmware).

For this reason, it seems better to move the disabling and enabling of
user mode helpers to separate functions that will be called by the PM core
as necessary.

[akpm@linux-foundation.org: remove unneeded ifdefs]
Signed-off-by: Rafael J. Wysocki 
Cc: Alan Stern 
Acked-by: Pavel Machek 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

snapshot: Use pm_mutex for mutual exclusion

2008-07-16T21:27:03+00:00

We can avoid taking the BKL in snapshot_ioctl() if pm_mutex is used to prevent
the ioctls from being executed concurrently.

In addition, although it is only possible to open /dev/snapshot once, the task
which has done that may spawn a child that will inherit the open descriptor,
so in theory they can call snapshot_write(), snapshot_read() and
snapshot_release() concurrently.  pm_mutex can also be used for mutual
exclusion in such cases.

Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Andi Kleen 
Acked-by: Pavel Machek 
Signed-off-by: Len Brown