Lockdep enabled kernels report a theoretical deadlock state where the
cmf_timer interrupt occurs while the rx_monitor ring is being destroyed.
During rmmod, the cmf_timer is cancelled prior to the
lpfc_rx_monitor_destroy_ring call. This actually eliminates the need to
take the rx_monitor ring lock in lpfc_rx_monitor_destroy_ring. Thus, just
remove lock/unlock of rx_monitor in lpfc_rx_monitor_destroy_ring.
Signed-off-by: Justin Tee <justin.tee@xxxxxxxxxxxx>
---
drivers/scsi/lpfc/lpfc_sli.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index bfab1f0fb3f0..c8b4632e3dd4 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -8080,16 +8080,16 @@ int lpfc_rx_monitor_create_ring(struct lpfc_rx_info_monitor *rx_monitor,
/**
* lpfc_rx_monitor_destroy_ring - Free ring buffer for rx_monitor
* @rx_monitor: Pointer to lpfc_rx_info_monitor object
+ *
+ * Called after cancellation of cmf_timer.
**/
void lpfc_rx_monitor_destroy_ring(struct lpfc_rx_info_monitor *rx_monitor)
{
- spin_lock(&rx_monitor->lock);
kfree(rx_monitor->ring);
rx_monitor->ring = NULL;
rx_monitor->entries = 0;
rx_monitor->head_idx = 0;
rx_monitor->tail_idx = 0;
- spin_unlock(&rx_monitor->lock);
}
/**
--
2.38.0
