snapshot: Use pm_mutex for mutual exclusion

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 <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Len Brown <[email protected]>