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scsi: cxlflash: Avoid double mutex unlock 

The AFU recovery routine uses an interruptible mutex to control the flow
of in-flight recoveries. Upon receiving an interruptible signal the code
branches to a common exit path which wrongly assumes the mutex is
held. Add a local variable to track when the mutex should be unlocked.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Matthew R. Ochs 2017-08-25 17:18:03 -05:00 committed by Martin K. Petersen
parent 48a17ad593
commit 1a9e394154
1 changed files with 10 additions and 3 deletions
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13
drivers/scsi/cxlflash/superpipe.c
View File

@ -1651,6 +1651,7 @@ static int cxlflash_afu_recover(struct scsi_device *sdev,
u64 ctxid = DECODE_CTXID(recover->context_id),
rctxid = recover->context_id;
long reg;
bool locked = true;
int lretry = 20; /* up to 2 seconds */
int new_adap_fd = -1;
int rc = 0;
@ -1659,8 +1660,11 @@ static int cxlflash_afu_recover(struct scsi_device *sdev,
up_read(&cfg->ioctl_rwsem);
rc = mutex_lock_interruptible(mutex);
down_read(&cfg->ioctl_rwsem);
if (rc)
if (rc) {
locked = false;
goto out;
}
rc = check_state(cfg);
if (rc) {
dev_err(dev, "%s: Failed state rc=%d\n", __func__, rc);
@ -1694,8 +1698,10 @@ retry_recover:
mutex_unlock(mutex);
msleep(100);
rc = mutex_lock_interruptible(mutex);
if (rc)
if (rc) {
locked = false;
goto out;
}
goto retry_recover;
}
@ -1739,7 +1745,8 @@ retry_recover:
out:
if (likely(ctxi))
put_context(ctxi);
mutex_unlock(mutex);
if (locked)
mutex_unlock(mutex);
atomic_dec_if_positive(&cfg->recovery_threads);
return rc;
}