Merge: scsi: megaraid_sas: Fix for a potential deadlock

MR: https://gitlab.com/redhat/rhel/src/kernel/rhel-9/-/merge_requests/3423

JIRA: https://issues.redhat.com/browse/RHEL-21980

CVE: CVE-2024-57807

Signed-off-by: Tomas Henzl <[email protected]>

Approved-by: Chris Leech <[email protected]>
Approved-by: Marc Milgram <[email protected]>
Approved-by: CKI KWF Bot <[email protected]>

Merged-by: CKI KWF Bot <[email protected]>

Author: CKI KWF Bot

drivers/scsi/megaraid/megaraid_sas_base.c

@@ -8905,8 +8905,11 @@ megasas_aen_polling(struct work_struct *work)
 						   (ld_target_id / MEGASAS_MAX_DEV_PER_CHANNEL),
 						   (ld_target_id % MEGASAS_MAX_DEV_PER_CHANNEL),
 						   0);
-			if (sdev1)
+			if (sdev1) {
+				mutex_unlock(&instance->reset_mutex);
 				megasas_remove_scsi_device(sdev1);
+				mutex_lock(&instance->reset_mutex);
+			}
 
 			event_type = SCAN_VD_CHANNEL;
 			break;