Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen...

[sfrench/cifs-2.6.git] / drivers / block / ub.c

diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index a70c1c29a7aa2c28e99c9fa352fa6f42b2048d17..27bfe72aab59360951b133b0be25c88ba85ea6c4 100644 (file)
--- 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;
        }
 
@@ -657,7 +659,6 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
        if ((cmd = ub_get_cmd(lun)) == NULL)
                return -1;
        memset(cmd, 0, sizeof(struct ub_scsi_cmd));
-       sg_init_table(cmd->sgv, UB_MAX_REQ_SG);
 
        blkdev_dequeue_request(rq);
 
@@ -668,6 +669,7 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
        /*
         * get scatterlist from block layer
         */
+       sg_init_table(&urq->sgv[0], UB_MAX_REQ_SG);
        n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]);
        if (n_elem < 0) {
                /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */
@@ -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,