2 files changed, 9 insertions, 3 deletions

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index f14665a6293d..6b1b4e91e53f 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -1857,11 +1857,16 @@ int mvs_slot_complete(struct mvs_info *mvi, u32 rx_desc, u32 flags)
                 goto out;
         }
 
-        /* error info record present */
-        if (unlikely((rx_desc & RXQ_ERR) && (*(u64 *) slot->response))) {
+        /*
+         * error info record present; slot->response is 32 bit aligned but may
+         * not be 64 bit aligned, so check for zero in two 32 bit reads
+         */
+        if (unlikely((rx_desc & RXQ_ERR)
+                     && (*((u32 *)slot->response)
+                         || *(((u32 *)slot->response) + 1)))) {
                 mv_dprintk("port %d slot %d rx_desc %X has error info"
                         "%016llX.\n", slot->port->sas_port.id, slot_idx,
-                         rx_desc, (u64)(*(u64 *)slot->response));
+                         rx_desc, get_unaligned_le64(slot->response));
                 tstat->stat = mvs_slot_err(mvi, task, slot_idx);
                 tstat->resp = SAS_TASK_COMPLETE;
                 goto out;
diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h
index 60e2fb7f2dca..d6b19dc80bee 100644
--- a/drivers/scsi/mvsas/mv_sas.h
+++ b/drivers/scsi/mvsas/mv_sas.h
@@ -39,6 +39,7 @@
 #include <linux/irq.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <asm/unaligned.h>
 #include <scsi/libsas.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_tcq.h>