Revert "[SCSI] extend the last_sector_bug flag to cover more sectors"

[linux-2.6-omap-h63xx.git] / drivers / scsi / sd.c

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d78564545543925fc6136c6e7c7fc994c028..8e08d51a0f0531d8bf661dc0d3bf8f822d35c357 100644 (file)
--- 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));