From: Bart Van Assche <bvanassche@acm.org>
Date: Thu, 7 Nov 2019 13:54:58 -0800
Subject: scsi: target: core: Document target_cmd_size_check()
Git-commit: 11bf1d14b2d6fd4f144d8ee3ac2e71057fc0ec35
Patch-mainline: v5.5-rc1
References: bsc#1177393

Since it is nontrivial to derive the meaning of the size argument from the
code, add a documentation header above target_cmd_size_check().

Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Link: https://lore.kernel.org/r/20191107215458.64242-1-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/target/target_core_transport.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 7f06a62f8661..652ef1c9a9f6 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1243,6 +1243,19 @@ target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
 	return TCM_NO_SENSE;
 }
 
+/**
+ * target_cmd_size_check - Check whether there will be a residual.
+ * @cmd: SCSI command.
+ * @size: Data buffer size derived from CDB. The data buffer size provided by
+ *   the SCSI transport driver is available in @cmd->data_length.
+ *
+ * Compare the data buffer size from the CDB with the data buffer limit from the transport
+ * header. Set @cmd->residual_count and SCF_OVERFLOW_BIT or SCF_UNDERFLOW_BIT if necessary.
+ *
+ * Note: target drivers set @cmd->data_length by calling transport_init_se_cmd().
+ *
+ * Return: TCM_NO_SENSE
+ */
 sense_reason_t
 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
 {