1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index d277e8620e3e..fcfeddc79331 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1783,6 +1783,8 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 {
         int result = SCpnt->result;
         unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
+        unsigned int sector_size = SCpnt->device->sector_size;
+        unsigned int resid;
         struct scsi_sense_hdr sshdr;
         struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
         struct request *req = SCpnt->request;
@@ -1813,6 +1815,21 @@ static int sd_done(struct scsi_cmnd *SCpnt)
                         scsi_set_resid(SCpnt, blk_rq_bytes(req));
                 }
                 break;
+        default:
+                /*
+                 * In case of bogus fw or device, we could end up having
+                 * an unaligned partial completion. Check this here and force
+                 * alignment.
+                 */
+                resid = scsi_get_resid(SCpnt);
+                if (resid & (sector_size - 1)) {
+                        sd_printk(KERN_INFO, sdkp,
+                                "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
+                                resid, sector_size);
+                        resid = min(scsi_bufflen(SCpnt),
+                                    round_up(resid, sector_size));
+                        scsi_set_resid(SCpnt, resid);
+                }
         }
 
         if (result) {