[PATCH 3.16.y-ckt 182/216] dm thin: fix inability to discard blocks when in out-of-data-space mode

3.16.7-ckt4 -stable review patch. If anyone has any objections, please let me know. -- From: Joe Thornber commit 45ec9bd0fd7abf8705e7cf12205ff69fe9d51181 upstream. When the pool was in PM_OUT_OF_SPACE mode its process_prepared_discard function pointer was incorrectly being

[PATCH 3.16.y-ckt 182/216] dm thin: fix inability to discard blocks when in out-of-data-space mode

3.16.7-ckt4 -stable review patch. If anyone has any objections, please let me know. -- From: Joe Thornber e...@redhat.com commit 45ec9bd0fd7abf8705e7cf12205ff69fe9d51181 upstream. When the pool was in PM_OUT_OF_SPACE mode its process_prepared_discard function pointer was