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scsi: core: Log SCSI command age with errors 

Couple of users had requested to print the SCSI command age along with
command failure errors. This is a small change, but allows users to get
more important information about the command that was failed, it would help
the users in debugging the command failures:

Link: https://lore.kernel.org/r/20190926052501.GA8352@machine1
Signed-off-by: Milan P. Gandhi <mgandhi@redhat.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Milan P. Gandhi 2019-09-26 10:55:02 +05:30 committed by Martin K. Petersen
parent c3dde2f3fe
commit 8ee132b3cb
1 changed files with 8 additions and 2 deletions
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10
drivers/scsi/scsi_logging.c
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@ -390,6 +390,7 @@ void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,
const char *mlret_string = scsi_mlreturn_string(disposition);
const char *hb_string = scsi_hostbyte_string(cmd->result);
const char *db_string = scsi_driverbyte_string(cmd->result);
unsigned long cmd_age = (jiffies - cmd->jiffies_at_alloc) / HZ;
logbuf = scsi_log_reserve_buffer(&logbuf_len);
if (!logbuf)
@ -431,10 +432,15 @@ void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,
if (db_string)
off += scnprintf(logbuf + off, logbuf_len - off,
"driverbyte=%s", db_string);
"driverbyte=%s ", db_string);
else
off += scnprintf(logbuf + off, logbuf_len - off,
"driverbyte=0x%02x", driver_byte(cmd->result));
"driverbyte=0x%02x ",
driver_byte(cmd->result));
off += scnprintf(logbuf + off, logbuf_len - off,
"cmd_age=%lus", cmd_age);
out_printk:
dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
scsi_log_release_buffer(logbuf);