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Subject[PATCH v2] 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:

Signed-off-by: Milan P. Gandhi <mgandhi@redhat.com>
---

changes v2:
- Changed the message to print SCSI command age as 'cmd_age'
and not 'cmd-age' to avoid any confusion.

1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_logging.c b/drivers/scsi/scsi_logging.c
index 39b8cc4574b4..0ccb4c95266d 100644
--- a/drivers/scsi/scsi_logging.c
+++ b/drivers/scsi/scsi_logging.c
@@ -432,6 +432,7 @@ 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)
@@ -473,10 +474,15 @@ 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);
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