3 files changed, 7 insertions, 23 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d7856454..8e08d51a0f05 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -375,7 +375,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
         struct gendisk *disk = rq->rq_disk;
         struct scsi_disk *sdkp;
         sector_t block = rq->sector;
-        sector_t threshold;
         unsigned int this_count = rq->nr_sectors;
         unsigned int timeout = sdp->timeout;
         int ret;
@@ -423,21 +422,13 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
         }
 
         /*
-         * Some SD card readers can't handle multi-sector accesses which touch
-         * the last one or two hardware sectors.  Split accesses as needed.
+         * Some devices (some sdcards for one) don't like it if the
+         * last sector gets read in a larger then 1 sector read.
          */
-        threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
-                (sdp->sector_size / 512);
-
-        if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
-                if (block < threshold) {
-                        /* Access up to the threshold but not beyond */
-                        this_count = threshold - block;
-                } else {
-                        /* Access only a single hardware sector */
-                        this_count = sdp->sector_size / 512;
-                }
-        }
+        if (unlikely(sdp->last_sector_bug &&
+            rq->nr_sectors > sdp->sector_size / 512 &&
+            block + this_count == get_capacity(disk)))
+                this_count -= sdp->sector_size / 512;
 
         SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
                                         (unsigned long long)block));
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 95b9f06534d5..550b2f70a1f8 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -31,12 +31,6 @@
  */
 #define SD_BUF_SIZE             512
 
-/*
- * Number of sectors at the end of the device to avoid multi-sector
- * accesses to in the case of last_sector_bug
- */
-#define SD_LAST_BUGGY_SECTORS   8
-
 struct scsi_disk {
         struct scsi_driver *driver;     /* always &sd_template */
         struct scsi_device *device;
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 291d56a19167..9cecc409f0f8 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -140,8 +140,7 @@ struct scsi_device {
         unsigned fix_capacity:1;        /* READ_CAPACITY is too high by 1 */
         unsigned guess_capacity:1;      /* READ_CAPACITY might be too high by 1 */
         unsigned retry_hwerror:1;       /* Retry HARDWARE_ERROR */
-        unsigned last_sector_bug:1;     /* do not use multisector accesses on
-                                           SD_LAST_BUGGY_SECTORS */
+        unsigned last_sector_bug:1;     /* Always read last sector in a 1 sector read */
 
         DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
         struct list_head event_list;    /* asserted events */