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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2012-08-28 18:38:02 +0400
committerJames Bottomley <JBottomley@Parallels.com>2012-09-24 12:10:59 +0400
commitb656688a90175d4c424a2f02264863ede7e82d7b (patch)
treed34e03ab53c0f226f98bffa5a392839c09a0d598
parentf2b0599de5450e11bc41be2432a161f86d816ae3 (diff)
[SCSI] mpt2sas: fix double mutex lock in NON_BLOCKING state
If state is NON_BLOCKING and mutex_trylock is succeed, the control flow goes to mutex_lock_interruptible() that is a deadlock. [jejb: fixed coding style problems] Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: "Sreekanth Reddy" <sreekanth.reddy@lsi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
-rw-r--r--drivers/scsi/mpt2sas/mpt2sas_ctl.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index 6425441..08685c4 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -2181,10 +2181,12 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
return -EAGAIN;
state = (file->f_flags & O_NONBLOCK) ? NON_BLOCKING : BLOCKING;
- if (state == NON_BLOCKING && !mutex_trylock(&ioc->ctl_cmds.mutex))
- return -EAGAIN;
- else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex))
+ if (state == NON_BLOCKING) {
+ if (!mutex_trylock(&ioc->ctl_cmds.mutex))
+ return -EAGAIN;
+ } else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex)) {
return -ERESTARTSYS;
+ }
switch (cmd) {
case MPT2IOCINFO: