lkml.org 
[lkml]   [2011]   [Jul]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[07/35] PM: Free memory bitmaps if opening /dev/snapshot fails
2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Michal Kubecek <mkubecek@suse.cz>

commit 8440f4b19494467883f8541b7aa28c7bbf6ac92b upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
kernel/power/user.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -113,8 +113,10 @@ static int snapshot_open(struct inode *i
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;



\
 
 \ /
  Last update: 2011-07-09 08:01    [W:0.251 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site