diff options
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 169 |
1 files changed, 62 insertions, 107 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index ff0449fbe3a0..53b9ff12e030 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -202,24 +202,17 @@ static void __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, bool unbusy) blk_mq_requeue_request(cmd->request, true); } -/* - * 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. +/** + * scsi_queue_insert - Reinsert a command in the queue. + * @cmd: command that we are adding to queue. + * @reason: why we are inserting command to queue. * - * Returns: Nothing. + * 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: 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. + * Context: This could be called either from an interrupt context or a normal + * process context. */ void scsi_queue_insert(struct scsi_cmnd *cmd, int reason) { @@ -301,16 +294,12 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, } EXPORT_SYMBOL(__scsi_execute); -/* - * Function: scsi_init_cmd_errh() - * - * Purpose: Initialize cmd fields related to error handling. - * - * Arguments: cmd - command that is ready to be queued. +/** + * scsi_init_cmd_errh - Initialize cmd fields related to error handling. + * @cmd: command that is ready to be queued. * - * Notes: This function has the job of initializing a number of - * fields related to error handling. Typically this will - * be called once for each command, as required. + * This function has the job of initializing a number of fields related to error + * handling. Typically this will be called once for each command, as required. */ static void scsi_init_cmd_errh(struct scsi_cmnd *cmd) { @@ -496,17 +485,11 @@ static void scsi_starved_list_run(struct Scsi_Host *shost) spin_unlock_irqrestore(shost->host_lock, flags); } -/* - * Function: scsi_run_queue() - * - * Purpose: Select a proper request queue to serve next - * - * Arguments: q - last request's queue - * - * Returns: Nothing +/** + * scsi_run_queue - Select a proper request queue to serve next. + * @q: last request's queue * - * Notes: The previous command was completely finished, start - * a new one if possible. + * The previous command was completely finished, start a new one if possible. */ static void scsi_run_queue(struct request_queue *q) { @@ -896,34 +879,27 @@ static int scsi_io_completion_nz_result(struct scsi_cmnd *cmd, int result, return result; } -/* - * Function: scsi_io_completion() - * - * Purpose: Completion processing for block device I/O requests. - * - * Arguments: cmd - command that is finished. - * - * Lock status: Assumed that no lock is held upon entry. - * - * Returns: Nothing - * - * Notes: We will finish off the specified number of sectors. If we - * are done, the command block will be released and the queue - * function will be goosed. If we are not done then we have to - * figure out what to do next: - * - * a) We can call scsi_requeue_command(). The request - * will be unprepared and put back on the queue. Then - * a new command will be created for it. This should - * be used if we made forward progress, or if we want - * to switch from READ(10) to READ(6) for example. - * - * b) We can call __scsi_queue_insert(). The request will - * be put back on the queue and retried using the same - * command as before, possibly after a delay. - * - * c) We can call scsi_end_request() with blk_stat other than - * BLK_STS_OK, to fail the remainder of the request. +/** + * scsi_io_completion - Completion processing for SCSI commands. + * @cmd: command that is finished. + * @good_bytes: number of processed bytes. + * + * We will finish off the specified number of sectors. If we are done, the + * command block will be released and the queue function will be goosed. If we + * are not done then we have to figure out what to do next: + * + * a) We can call scsi_io_completion_reprep(). The request will be + * unprepared and put back on the queue. Then a new command will + * be created for it. This should be used if we made forward + * progress, or if we want to switch from READ(10) to READ(6) for + * example. + * + * b) We can call scsi_io_completion_action(). The request will be + * put back on the queue and retried using the same command as + * before, possibly after a delay. + * + * c) We can call scsi_end_request() with blk_stat other than + * BLK_STS_OK, to fail the remainder of the request. */ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) { @@ -951,8 +927,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) blk_rq_sectors(req), good_bytes)); /* - * Next deal with any sectors which we were able to correctly - * handle. Failed, zero length commands always need to drop down + * Failed, zero length commands always need to drop down * to retry code. Fast path should return in this block. */ if (likely(blk_rq_bytes(req) > 0 || blk_stat == BLK_STS_OK)) { @@ -1002,16 +977,14 @@ static blk_status_t scsi_init_sgtable(struct request *req, return BLK_STS_OK; } -/* - * Function: scsi_init_io() - * - * Purpose: SCSI I/O initialize function. - * - * Arguments: cmd - Command descriptor we wish to initialize +/** + * scsi_init_io - SCSI I/O initialization function. + * @cmd: command descriptor we wish to initialize * - * Returns: BLK_STS_OK on success - * BLK_STS_RESOURCE if the failure is retryable - * BLK_STS_IOERR if the failure is fatal + * Returns: + * * BLK_STS_OK - on success + * * BLK_STS_RESOURCE - if the failure is retryable + * * BLK_STS_IOERR - if the failure is fatal */ blk_status_t scsi_init_io(struct scsi_cmnd *cmd) { @@ -1921,21 +1894,13 @@ struct scsi_device *scsi_device_from_queue(struct request_queue *q) } EXPORT_SYMBOL_GPL(scsi_device_from_queue); -/* - * Function: scsi_block_requests() - * - * Purpose: Utility function used by low-level drivers to prevent further - * commands from being queued to the device. - * - * Arguments: shost - Host in question - * - * Returns: Nothing - * - * Lock status: No locks are assumed held. +/** + * scsi_block_requests - Utility function used by low-level drivers to prevent + * further commands from being queued to the device. + * @shost: host in question * - * Notes: There is no timer nor any other means by which the requests - * get unblocked other than the low-level driver calling - * scsi_unblock_requests(). + * There is no timer nor any other means by which the requests get unblocked + * other than the low-level driver calling scsi_unblock_requests(). */ void scsi_block_requests(struct Scsi_Host *shost) { @@ -1943,25 +1908,15 @@ void scsi_block_requests(struct Scsi_Host *shost) } EXPORT_SYMBOL(scsi_block_requests); -/* - * Function: scsi_unblock_requests() - * - * Purpose: Utility function used by low-level drivers to allow further - * commands from being queued to the device. - * - * Arguments: shost - Host in question - * - * Returns: Nothing - * - * Lock status: No locks are assumed held. - * - * Notes: There is no timer nor any other means by which the requests - * get unblocked other than the low-level driver calling - * scsi_unblock_requests(). - * - * This is done as an API function so that changes to the - * internals of the scsi mid-layer won't require wholesale - * changes to drivers that use this feature. +/** + * scsi_unblock_requests - Utility function used by low-level drivers to allow + * further commands to be queued to the device. + * @shost: host in question + * + * There is no timer nor any other means by which the requests get unblocked + * other than the low-level driver calling scsi_unblock_requests(). This is done + * as an API function so that changes to the internals of the scsi mid-layer + * won't require wholesale changes to drivers that use this feature. */ void scsi_unblock_requests(struct Scsi_Host *shost) { |