tree 3682e034553d8b9ac676e17b144fe5b15cbb0174
parent f76b168b6f117a49d36307053e1acbe30580ea5b
author Michal Kubecek <mkubecek@suse.cz> 1308422041 +0200
committer Rafael J. Wysocki <rjw@sisk.pl> 1308691206 +0200

PM: Free memory bitmaps if opening /dev/snapshot fails

When opening /dev/snapshot device, snapshot_open() creates memory
bitmaps which are freed in snapshot_release(). But if any of the
callbacks called by pm_notifier_call_chain() returns NOTIFY_BAD, open()
fails, snapshot_release() is never called and bitmaps are not freed.
Next attempt to open /dev/snapshot then triggers BUG_ON() check in
create_basic_memory_bitmaps(). This happens e.g. when vmwatchdog module
is active on s390x.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: stable@kernel.org