From: Hannes Reinecke Date: Fri, 24 Oct 2014 12:27:04 +0000 (+0200) Subject: scsi: document scsi_try_to_abort_cmd X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=883a030f989a17b81167f3a181cf93d741fa98b4;p=linux-beck.git scsi: document scsi_try_to_abort_cmd scsi_try_to_abort_cmd() should only return SUCCESS, FAILED, or FAST_IO_FAIL. So document that in the function description and simplify the logging message. Signed-off-by: Hannes Reinecke Suggested-by: Christoph Hellwig Reviewed-by: Robert Elliott Signed-off-by: Christoph Hellwig --- diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 44e2576878a3..95c9abb64183 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -157,8 +157,9 @@ scmd_eh_abort_handler(struct work_struct *work) } else { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, - "scmd %p abort failed, rtn %d\n", - scmd, rtn)); + "scmd %p abort %s\n", scmd, + (rtn == FAST_IO_FAIL) ? + "not send" : "failed")); } } @@ -869,7 +870,24 @@ static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) return rtn; } -static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) +/** + * scsi_try_to_abort_cmd - Ask host to abort a SCSI command + * @scmd: SCSI cmd used to send a target reset + * + * Return value: + * SUCCESS, FAILED, or FAST_IO_FAIL + * + * Notes: + * SUCCESS does not necessarily indicate that the command + * has been aborted; it only indicates that the LLDDs + * has cleared all references to that command. + * LLDDs should return FAILED only if an abort was required + * but could not be executed. LLDDs should return FAST_IO_FAIL + * if the device is temporarily unavailable (eg due to a + * link down on FibreChannel) + */ +static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, + struct scsi_cmnd *scmd) { if (!hostt->eh_abort_handler) return FAILED;