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Message-Id: <20191106210346.164715-1-andrealmeid@collabora.com>
Date: Wed, 6 Nov 2019 18:03:46 -0300
From: André Almeida <andrealmeid@...labora.com>
To: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Cc: kernel@...labora.com, krisman@...labora.com, jejb@...ux.ibm.com,
martin.petersen@...cle.com,
André Almeida <andrealmeid@...labora.com>
Subject: [PATCH v2] scsi: core: Change function comments to kernel-doc style
Despite of functions being documented, they are not in the kernel-doc
specification, and could not be included in kernel documentation. Change
the style of functions comments to be compliant to the kernel-doc style.
When the function comment is outdated, update then.
Signed-off-by: André Almeida <andrealmeid@...labora.com>
---
Hello,
This v2 is from a commit originally from this serie:
https://patchwork.kernel.org/patch/11141867/
This patched was tested with kernel-doc script and the HTML output was
verified as well.
Thanks,
André
Changes from v1:
- Update "midlevel queue" to "scheduler queue". This seems to be the
correct term after following the call stack until reach a call to
blk_mq_sched_requeue_request().
- Update names of functions at scsi_io_completion() comment.
- Remove duplicated comment at scsi_io_completion().
---
drivers/scsi/scsi_lib.c | 169 +++++++++++++++-------------------------
1 file changed, 62 insertions(+), 107 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2563b061f56b..8f7637e6d701 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 scheduler 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)
{
@@ -897,34 +880,27 @@ 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)
{
@@ -952,8 +928,7 @@ 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)) {
@@ -1003,16 +978,14 @@ 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 initialize 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)
{
@@ -1929,21 +1902,13 @@ 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)
{
@@ -1951,25 +1916,15 @@ 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 from being 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)
{
--
2.23.0
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