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authorHans de Goede <j.w.r.degoede@hhs.nl>2008-01-20 11:12:26 +0100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-23 11:29:34 -0600
commita0899d4df534d2bcf671b0f647b809842309a9ae (patch)
tree990c3eb7876f6f8a6dee37ec2ecd4684c11b1f74 /drivers/scsi
parentb523381e325366cc54a2548df418c2a427b2f2ee (diff)
[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 <j.w.r.degoede@hhs.nl> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/sd.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 212f6bcfd45..24eba3118b5 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));