diff options
| author | Michal Kubecek <mkubecek@suse.cz> | 2011-06-18 20:34:01 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-06-21 23:20:06 +0200 |
| commit | 8440f4b19494467883f8541b7aa28c7bbf6ac92b (patch) | |
| tree | 3682e034553d8b9ac676e17b144fe5b15cbb0174 /kernel | |
| parent | f76b168b6f117a49d36307053e1acbe30580ea5b (diff) | |
| download | lwn-8440f4b19494467883f8541b7aa28c7bbf6ac92b.tar.gz lwn-8440f4b19494467883f8541b7aa28c7bbf6ac92b.zip | |
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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/user.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c index 7d02d33be699..42ddbc6f0de6 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -113,8 +113,10 @@ static int snapshot_open(struct inode *inode, struct file *filp) if (error) pm_notifier_call_chain(PM_POST_RESTORE); } - if (error) + if (error) { + free_basic_memory_bitmaps(); atomic_inc(&snapshot_device_available); + } data->frozen = 0; data->ready = 0; data->platform_support = 0; |