mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-10 12:53:04 -04:00
Code Issues Packages Projects Releases Wiki Activity

RDMA/irdma: Fix deadlock in irdma_cleanup_cm_core()

Browse Source 
There is a deadlock in irdma_cleanup_cm_core(), which is shown below:

   (Thread 1)              |      (Thread 2)
                           | irdma_schedule_cm_timer()
irdma_cleanup_cm_core()    |  add_timer()
 spin_lock_irqsave() //(1) |  (wait a time)
 ...                       | irdma_cm_timer_tick()
 del_timer_sync()          |  spin_lock_irqsave() //(2)
 (wait timer to stop)      |  ...

We hold cm_core->ht_lock in position (1) of thread 1 and use
del_timer_sync() to wait timer to stop, but timer handler also need
cm_core->ht_lock in position (2) of thread 2.  As a result,
irdma_cleanup_cm_core() will block forever.

This patch removes the check of timer_pending() in
irdma_cleanup_cm_core(), because the del_timer_sync() function will just
return directly if there isn't a pending timer. As a result, the lock is
redundant, because there is no resource it could protect.

Link: https://lore.kernel.org/r/20220418153322.42524-1-duoming@zju.edu.cn
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Reviewed-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Duoming Zhou
2022-04-18 23:33:22 +08:00
committed by Jason Gunthorpe
parent 290c4a902b
commit 679ab61bf5
1 changed files with 1 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/infiniband/hw/irdma/cm.c
View File

@@ -3246,15 +3246,10 @@ int irdma_setup_cm_core(struct irdma_device *iwdev, u8 rdma_ver)
*/
void irdma_cleanup_cm_core(struct irdma_cm_core *cm_core)
{
unsigned long flags;
if (!cm_core)
return;
spin_lock_irqsave(&cm_core->ht_lock, flags);
if (timer_pending(&cm_core->tcp_timer))
del_timer_sync(&cm_core->tcp_timer);
spin_unlock_irqrestore(&cm_core->ht_lock, flags);
del_timer_sync(&cm_core->tcp_timer);
destroy_workqueue(cm_core->event_wq);
cm_core->dev->ws_reset(&cm_core->iwdev->vsi);