diff options
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 119 |
1 files changed, 79 insertions, 40 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index f2f51e0333eb..940dc32ff0dc 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -91,26 +91,19 @@ static void scsi_unprep_request(struct request *req) scsi_put_command(cmd); } -/* - * Function: scsi_queue_insert() - * - * Purpose: Insert a command in the midlevel queue. - * - * Arguments: cmd - command that we are adding to queue. - * reason - why we are inserting command to queue. - * - * Lock status: Assumed that lock is not held upon entry. - * - * Returns: Nothing. - * - * Notes: We do this for one of two cases. Either the host is busy - * and it cannot accept any more commands for the time being, - * or the device returned QUEUE_FULL and can accept no more - * commands. - * Notes: This could be called either from an interrupt context or a - * normal process context. +/** + * __scsi_queue_insert - private queue insertion + * @cmd: The SCSI command being requeued + * @reason: The reason for the requeue + * @unbusy: Whether the queue should be unbusied + * + * This is a private queue insertion. The public interface + * scsi_queue_insert() always assumes the queue should be unbusied + * because it's always called before the completion. This function is + * for a requeue after completion, which should only occur in this + * file. */ -int scsi_queue_insert(struct scsi_cmnd *cmd, int reason) +static int __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, int unbusy) { struct Scsi_Host *host = cmd->device->host; struct scsi_device *device = cmd->device; @@ -150,7 +143,8 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason) * Decrement the counters, since these commands are no longer * active on the host/device. */ - scsi_device_unbusy(device); + if (unbusy) + scsi_device_unbusy(device); /* * Requeue this command. It will go before all other commands @@ -172,6 +166,29 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason) return 0; } +/* + * Function: scsi_queue_insert() + * + * Purpose: Insert a command in the midlevel queue. + * + * Arguments: cmd - command that we are adding to queue. + * reason - why we are inserting command to queue. + * + * Lock status: Assumed that lock is not held upon entry. + * + * Returns: Nothing. + * + * Notes: We do this for one of two cases. Either the host is busy + * and it cannot accept any more commands for the time being, + * or the device returned QUEUE_FULL and can accept no more + * commands. + * Notes: This could be called either from an interrupt context or a + * normal process context. + */ +int scsi_queue_insert(struct scsi_cmnd *cmd, int reason) +{ + return __scsi_queue_insert(cmd, reason, 1); +} /** * scsi_execute - insert request and wait for the result * @sdev: scsi device @@ -684,6 +701,8 @@ void scsi_run_host_queues(struct Scsi_Host *shost) scsi_run_queue(sdev->request_queue); } +static void __scsi_release_buffers(struct scsi_cmnd *, int); + /* * Function: scsi_end_request() * @@ -732,6 +751,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error, * leftovers in the front of the * queue, and goose the queue again. */ + scsi_release_buffers(cmd); scsi_requeue_command(q, cmd); cmd = NULL; } @@ -743,6 +763,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error, * This will goose the queue request function at the end, so we don't * need to worry about launching another command. */ + __scsi_release_buffers(cmd, 0); scsi_next_command(cmd); return NULL; } @@ -798,6 +819,26 @@ static void scsi_free_sgtable(struct scsi_data_buffer *sdb) __sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, scsi_sg_free); } +static void __scsi_release_buffers(struct scsi_cmnd *cmd, int do_bidi_check) +{ + + if (cmd->sdb.table.nents) + scsi_free_sgtable(&cmd->sdb); + + memset(&cmd->sdb, 0, sizeof(cmd->sdb)); + + if (do_bidi_check && scsi_bidi_cmnd(cmd)) { + struct scsi_data_buffer *bidi_sdb = + cmd->request->next_rq->special; + scsi_free_sgtable(bidi_sdb); + kmem_cache_free(scsi_sdb_cache, bidi_sdb); + cmd->request->next_rq->special = NULL; + } + + if (scsi_prot_sg_count(cmd)) + scsi_free_sgtable(cmd->prot_sdb); +} + /* * Function: scsi_release_buffers() * @@ -817,21 +858,7 @@ static void scsi_free_sgtable(struct scsi_data_buffer *sdb) */ void scsi_release_buffers(struct scsi_cmnd *cmd) { - if (cmd->sdb.table.nents) - scsi_free_sgtable(&cmd->sdb); - - memset(&cmd->sdb, 0, sizeof(cmd->sdb)); - - if (scsi_bidi_cmnd(cmd)) { - struct scsi_data_buffer *bidi_sdb = - cmd->request->next_rq->special; - scsi_free_sgtable(bidi_sdb); - kmem_cache_free(scsi_sdb_cache, bidi_sdb); - cmd->request->next_rq->special = NULL; - } - - if (scsi_prot_sg_count(cmd)) - scsi_free_sgtable(cmd->prot_sdb); + __scsi_release_buffers(cmd, 1); } EXPORT_SYMBOL(scsi_release_buffers); @@ -945,7 +972,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) } BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */ - scsi_release_buffers(cmd); /* * Next deal with any sectors which we were able to correctly @@ -963,6 +989,8 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) return; this_count = blk_rq_bytes(req); + error = -EIO; + if (host_byte(result) == DID_RESET) { /* Third party bus reset or reset for error recovery * reasons. Just retry the command and see what @@ -1004,13 +1032,18 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) /* This will issue a new 6-byte command. */ cmd->device->use_10_for_rw = 0; action = ACTION_REPREP; + } else if (sshdr.asc == 0x10) /* DIX */ { + description = "Host Data Integrity Failure"; + action = ACTION_FAIL; + error = -EILSEQ; } else action = ACTION_FAIL; break; case ABORTED_COMMAND: if (sshdr.asc == 0x10) { /* DIF */ + description = "Target Data Integrity Failure"; action = ACTION_FAIL; - description = "Data Integrity Failure"; + error = -EILSEQ; } else action = ACTION_RETRY; break; @@ -1029,6 +1062,10 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) case 0x09: /* self test in progress */ action = ACTION_DELAYED_RETRY; break; + default: + description = "Device not ready"; + action = ACTION_FAIL; + break; } } else { description = "Device not ready"; @@ -1052,9 +1089,10 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) switch (action) { case ACTION_FAIL: /* Give up and fail the remainder of the request */ + scsi_release_buffers(cmd); if (!(req->cmd_flags & REQ_QUIET)) { if (description) - scmd_printk(KERN_INFO, cmd, "%s", + scmd_printk(KERN_INFO, cmd, "%s\n", description); scsi_print_result(cmd); if (driver_byte(result) & DRIVER_SENSE) @@ -1067,15 +1105,16 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) /* Unprep the request and put it back at the head of the queue. * A new command will be prepared and issued. */ + scsi_release_buffers(cmd); scsi_requeue_command(q, cmd); break; case ACTION_RETRY: /* Retry the same command immediately */ - scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY); + __scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY, 0); break; case ACTION_DELAYED_RETRY: /* Retry the same command after a delay */ - scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); + __scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY, 0); break; } } |