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[PATCH] IB: fix userspace CM deadlock

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Fix deadlock condition resulting from trying to destroy a cm_id
from the context of a CM thread.  The synchronization around the
ucm context structure is simplified as a result, and some simple
code cleanup is included.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Sean Hefty
2005-08-19 13:46:34 -07:00
committed by Roland Dreier
parent 4ce059378c
commit b9ef520f9c
2 changed files with 160 additions and 313 deletions
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464
drivers/infiniband/core/ucm.c
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9
drivers/infiniband/core/ucm.h
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@@ -48,9 +48,7 @@
struct ib_ucm_file {
struct semaphore mutex;
struct file *filp;
/*
* list of pending events
*/
struct list_head ctxs; /* list of active connections */
struct list_head events; /* list of pending events */
wait_queue_head_t poll_wait;
@@ -58,12 +56,11 @@ struct ib_ucm_file {
struct ib_ucm_context {
int id;
int ref;
int error;
wait_queue_head_t wait;
atomic_t ref;
struct ib_ucm_file *file;
struct ib_cm_id *cm_id;
struct semaphore mutex;
struct list_head events; /* list of pending events. */
struct list_head file_list; /* member in file ctx list */