aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/ub.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/ub.c')
-rw-r--r--drivers/block/ub.c38
1 files changed, 29 insertions, 9 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index c452e2d355e..27bfe72aab5 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -8,6 +8,7 @@
* and is not licensed separately. See file COPYING for details.
*
* TODO (sorted by decreasing priority)
+ * -- Return sense now that rq allows it (we always auto-sense anyway).
* -- set readonly flag for CDs, set removable flag for CF readers
* -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
* -- verify the 13 conditions and do bulk resets
@@ -359,7 +360,8 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
struct ub_scsi_cmd *cmd, struct ub_request *urq);
static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
-static void ub_end_rq(struct request *rq, unsigned int status);
+static void ub_end_rq(struct request *rq, unsigned int status,
+ unsigned int cmd_len);
static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
struct ub_request *urq, struct ub_scsi_cmd *cmd);
static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
@@ -642,13 +644,13 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
if (atomic_read(&sc->poison)) {
blkdev_dequeue_request(rq);
- ub_end_rq(rq, DID_NO_CONNECT << 16);
+ ub_end_rq(rq, DID_NO_CONNECT << 16, blk_rq_bytes(rq));
return 0;
}
if (lun->changed && !blk_pc_request(rq)) {
blkdev_dequeue_request(rq);
- ub_end_rq(rq, SAM_STAT_CHECK_CONDITION);
+ ub_end_rq(rq, SAM_STAT_CHECK_CONDITION, blk_rq_bytes(rq));
return 0;
}
@@ -701,7 +703,7 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
drop:
ub_put_cmd(lun, cmd);
- ub_end_rq(rq, DID_ERROR << 16);
+ ub_end_rq(rq, DID_ERROR << 16, blk_rq_bytes(rq));
return 0;
}
@@ -770,6 +772,7 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
struct ub_request *urq = cmd->back;
struct request *rq;
unsigned int scsi_status;
+ unsigned int cmd_len;
rq = urq->rq;
@@ -779,8 +782,18 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
rq->data_len = 0;
else
rq->data_len -= cmd->act_len;
+ scsi_status = 0;
+ } else {
+ if (cmd->act_len != cmd->len) {
+ if ((cmd->key == MEDIUM_ERROR ||
+ cmd->key == UNIT_ATTENTION) &&
+ ub_rw_cmd_retry(sc, lun, urq, cmd) == 0)
+ return;
+ scsi_status = SAM_STAT_CHECK_CONDITION;
+ } else {
+ scsi_status = 0;
+ }
}
- scsi_status = 0;
} else {
if (blk_pc_request(rq)) {
/* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
@@ -801,14 +814,17 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
urq->rq = NULL;
+ cmd_len = cmd->len;
ub_put_cmd(lun, cmd);
- ub_end_rq(rq, scsi_status);
+ ub_end_rq(rq, scsi_status, cmd_len);
blk_start_queue(lun->disk->queue);
}
-static void ub_end_rq(struct request *rq, unsigned int scsi_status)
+static void ub_end_rq(struct request *rq, unsigned int scsi_status,
+ unsigned int cmd_len)
{
int error;
+ long rqlen;
if (scsi_status == 0) {
error = 0;
@@ -816,8 +832,12 @@ static void ub_end_rq(struct request *rq, unsigned int scsi_status)
error = -EIO;
rq->errors = scsi_status;
}
- if (__blk_end_request(rq, error, blk_rq_bytes(rq)))
- BUG();
+ rqlen = blk_rq_bytes(rq); /* Oddly enough, this is the residue. */
+ if (__blk_end_request(rq, error, cmd_len)) {
+ printk(KERN_WARNING DRV_NAME
+ ": __blk_end_request blew, %s-cmd total %u rqlen %ld\n",
+ blk_pc_request(rq)? "pc": "fs", cmd_len, rqlen);
+ }
}
static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,