[PATCH 3.4 044/172] dm snapshot: fix a possible invalid memory access on unload

2015-06-16 Thread lizf
From: Mikulas Patocka 3.4.108-rc1 review patch. If anyone has any objections, please let me know. -- commit 22aa66a3ee5b61e0f4a0bfeabcaa567861109ec3 upstream. When the snapshot target is unloaded, snapshot_dtr() waits until pending_exceptions_count drops to zero. Then, it

[PATCH 3.4 044/172] dm snapshot: fix a possible invalid memory access on unload

2015-06-16 Thread lizf
From: Mikulas Patocka mpato...@redhat.com 3.4.108-rc1 review patch. If anyone has any objections, please let me know. -- commit 22aa66a3ee5b61e0f4a0bfeabcaa567861109ec3 upstream. When the snapshot target is unloaded, snapshot_dtr() waits until pending_exceptions_count drops