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| author | Hans de Goede <j.w.r.degoede@hhs.nl> | 2008-01-20 11:12:26 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-01-23 11:29:34 -0600 |
| commit | a0899d4df534d2bcf671b0f647b809842309a9ae (patch) | |
| tree | 990c3eb7876f6f8a6dee37ec2ecd4684c11b1f74 | |
| parent | b523381e325366cc54a2548df418c2a427b2f2ee (diff) | |
| download | linux-a0899d4df534d2bcf671b0f647b809842309a9ae.tar.bz2 | |
[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>
| -rw-r--r-- | drivers/scsi/sd.c | 9 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 1 |
2 files changed, 10 insertions, 0 deletions
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)); diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index e0c645ac5014..3c8f898b160e 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -139,6 +139,7 @@ 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; /* 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 */ |