diff options
| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2012-08-28 18:38:02 +0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-09-24 12:10:59 +0400 |
| commit | b656688a90175d4c424a2f02264863ede7e82d7b (patch) | |
| tree | d34e03ab53c0f226f98bffa5a392839c09a0d598 /drivers/scsi/mpt2sas/mpt2sas_ctl.c | |
| parent | f2b0599de5450e11bc41be2432a161f86d816ae3 (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>
Diffstat (limited to 'drivers/scsi/mpt2sas/mpt2sas_ctl.c')
| -rw-r--r-- | drivers/scsi/mpt2sas/mpt2sas_ctl.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c index 64254416a178..08685c4cf231 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: |