From a0899d4df534d2bcf671b0f647b809842309a9ae Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 20 Jan 2008 11:12:26 +0100 Subject: [SCSI] sd: add fix for devices with last sector access problems This patch adds a new scsi_device flag (last_sector_bug) for devices which contain a bug where the device crashes when the last sector is read in a larger then 1 sector read. This is for example the case with sdcards in the HP PSC1350 printer cardreader and in the HP PSC1610 printer cardreader. Signed-off-by: Hans de Goede Signed-off-by: James Bottomley --- drivers/scsi/sd.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/scsi/sd.c') diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 212f6bcfd457..24eba3118b5a 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -395,6 +395,15 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq) goto out; } + /* + * Some devices (some sdcards for one) don't like it if the + * last sector gets read in a larger then 1 sector read. + */ + 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)); -- cgit v1.2.2