diff options
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index e5e7d785645..8e08d51a0f0 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)); |