[PATCH 5.15 181/262] iavf: Fix deadlock in iavf_reset_task

[Greg Kroah-Hartman]

From: Slawomir Laba <slawomirx.laba@xxxxxxxxx>

commit e85ff9c631e1bf109ce8428848dfc8e8b0041f48 upstream.

There exists a missing mutex_unlock call on crit_lock in
iavf_reset_task call path.

Unlock the crit_lock before returning from reset task.

Fixes: 5ac49f3c2702 ("iavf: use mutexes for locking of critical sections")
Signed-off-by: Slawomir Laba <slawomirx.laba@xxxxxxxxx>
Signed-off-by: Phani Burra <phani.r.burra@xxxxxxxxx>
Signed-off-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@xxxxxxxxx>
Tested-by: Konrad Jankowski <konrad0.jankowski@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -2206,6 +2206,7 @@ static void iavf_reset_task(struct work_
 			reg_val);
 		iavf_disable_vf(adapter);
 		mutex_unlock(&adapter->client_lock);
+		mutex_unlock(&adapter->crit_lock);
 		return; /* Do not attempt to reinit. It's dead, Jim. */
 	}