scsi: lpfc: Fix lockdep warning for rx_monitor lock when unloading driver

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@broadcom.com>
Link: https://lore.kernel.org/r/20230301231626.9621-4-justintee8345@gmail.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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);
 }
 
 /**