scsi: megaraid_sas: Retry reads of outbound_intr_status reg

ANBZ: torvalds#633

commit c65bfc8 upstream.

commit 272652f ("scsi: megaraid_sas: add retry logic in megasas_readl")
missed changing readl to megasas_readl in megasas_clear_intr_fusion().  For
Aero controllers, reads of outbound_intr_status register needs to be
retried.

Reported-by: Tomas Henzl <[email protected]>
Signed-off-by: Shivasharan S <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Reviewed-by: Xunlei Pang <[email protected]>
Signed-off-by: Guixin Liu <[email protected]>

drivers/scsi/megaraid/megaraid_sas_fusion.c

@@ -173,7 +173,8 @@ megasas_clear_intr_fusion(struct megasas_instance *instance)
 	/*
 	 * Check if it is our interrupt
 	 */
-	status = readl(&regs->outbound_intr_status);
+	status = megasas_readl(instance,
+			       &regs->outbound_intr_status);
 
 	if (status & 1) {
 		writel(status, &regs->outbound_intr_status);