scsi: scsi_lib: Add kernel-doc for exported functions

Add kernel-doc for scsi_failures_reset_retries() and scsi_alloc_request()
since these are exported.  This allows them to be part of the SCSI
driver-api docbook.

Fix kernel-doc comments for scsi_vpd_tpg_id() [add kernel-doc for one
parameter and fix a typo].

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20241212205217.597844-4-rdunlap@infradead.org
CC: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
CC: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: rddunlap

drivers/scsi/scsi_lib.c

@@ -184,6 +184,10 @@ void scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
 	__scsi_queue_insert(cmd, reason, true);
 }
 
+/**
+ * scsi_failures_reset_retries - reset all failures to zero
+ * @failures: &struct scsi_failures with specific failure modes set
+ */
 void scsi_failures_reset_retries(struct scsi_failures *failures)
 {
 	struct scsi_failure *failure;
@@ -1214,6 +1218,15 @@ static void scsi_initialize_rq(struct request *rq)
 	cmd->retries = 0;
 }
 
+/**
+ * scsi_alloc_request - allocate a block request and partially
+ *                      initialize its &scsi_cmnd
+ * @q: the device's request queue
+ * @opf: the request operation code
+ * @flags: block layer allocation flags
+ *
+ * Return: &struct request pointer on success or %NULL on failure
+ */
 struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf,
 				   blk_mq_req_flags_t flags)
 {
@@ -3365,14 +3378,16 @@ int scsi_vpd_lun_id(struct scsi_device *sdev, char *id, size_t id_len)
 }
 EXPORT_SYMBOL(scsi_vpd_lun_id);
 
-/*
+/**
  * scsi_vpd_tpg_id - return a target port group identifier
  * @sdev: SCSI device
+ * @rel_id: pointer to return relative target port in if not %NULL
  *
  * Returns the Target Port Group identifier from the information
- * froom VPD page 0x83 of the device.
+ * from VPD page 0x83 of the device.
+ * Optionally sets @rel_id to the relative target port on success.
  *
- * Returns the identifier or error on failure.
+ * Return: the identifier or error on failure.
  */
 int scsi_vpd_tpg_id(struct scsi_device *sdev, int *rel_id)
 {