Rafael J. Wysocki 25f2f3daad snapshot: Use pm_mutex for mutual exclusion ...

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 <rjw@sisk.pl>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Len Brown <len.brown@intel.com>

2008-07-16 23:27:03 +02:00

..

console.c

PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch

2008-04-28 08:58:36 -07:00

disk.c

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Kconfig

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main.c

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Makefile

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power.h

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poweroff.c

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process.c

Freezer: Introduce PF_FREEZER_NOSIG

2008-07-16 23:27:03 +02:00

snapshot.c

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swap.c

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swsusp.c

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user.c

snapshot: Use pm_mutex for mutual exclusion

2008-07-16 23:27:03 +02:00