From e6c11dbb8da81c599ca09ef2f6311220e068acd8 Mon Sep 17 00:00:00 2001 From: Maurizio Lombardi Date: Thu, 10 Jul 2014 09:41:53 +0200 Subject: [PATCH] scsi_lib: remove the description string in scsi_io_completion() During IO with fabric faults, one generally sees several "Unhandled error code" messages in the syslog as shown below: sd 4:0:6:2: [sdbw] Unhandled error code sd 4:0:6:2: [sdbw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK sd 4:0:6:2: [sdbw] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00 end_request: I/O error, dev sdbw, sector 0 This comes from scsi_io_completion (in scsi_lib.c) while handling error codes other than DID_RESET or not deferred sense keys i.e. this is actually handled by the SCSI mid layer. But what gets displayed here is "Unhandled error code" which is quite misleading as it indicates something that is not addressed by the mid layer. The description string is based on the sense key and sometimes on the additional sense code; since the ACTION_FAIL case always prints the sense key and the additional sense code, this patch removes the description string completely because it does not add useful information. Signed-off-by: Maurizio Lombardi Reviewed-by: Hannes Reinecke Signed-off-by: Christoph Hellwig --- drivers/scsi/scsi_lib.c | 40 ++++------------------------------------ 1 file changed, 4 insertions(+), 36 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index db7b7f2..03076b2 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -685,7 +685,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) int sense_deferred = 0; enum {ACTION_FAIL, ACTION_REPREP, ACTION_RETRY, ACTION_DELAYED_RETRY} action; - char *description = NULL; unsigned long wait_for = (cmd->allowed + 1) * req->timeout; if (result) { @@ -810,7 +809,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) * and quietly refuse further access. */ cmd->device->changed = 1; - description = "Media Changed"; action = ACTION_FAIL; } else { /* Must have been a power glitch, or a @@ -838,27 +836,10 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) cmd->device->use_10_for_rw = 0; action = ACTION_REPREP; } else if (sshdr.asc == 0x10) /* DIX */ { - description = "Host Data Integrity Failure"; action = ACTION_FAIL; error = -EILSEQ; /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ } else if (sshdr.asc == 0x20 || sshdr.asc == 0x24) { - switch (cmd->cmnd[0]) { - case UNMAP: - description = "Discard failure"; - break; - case WRITE_SAME: - case WRITE_SAME_16: - if (cmd->cmnd[1] & 0x8) - description = "Discard failure"; - else - description = - "Write same failure"; - break; - default: - description = "Invalid command failure"; - break; - } action = ACTION_FAIL; error = -EREMOTEIO; } else @@ -866,10 +847,8 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) break; case ABORTED_COMMAND: action = ACTION_FAIL; - if (sshdr.asc == 0x10) { /* DIF */ - description = "Target Data Integrity Failure"; + if (sshdr.asc == 0x10) /* DIF */ error = -EILSEQ; - } break; case NOT_READY: /* If the device is in the process of becoming @@ -888,42 +867,31 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) action = ACTION_DELAYED_RETRY; break; default: - description = "Device not ready"; action = ACTION_FAIL; break; } - } else { - description = "Device not ready"; + } else action = ACTION_FAIL; - } break; case VOLUME_OVERFLOW: /* See SSC3rXX or current. */ action = ACTION_FAIL; break; default: - description = "Unhandled sense code"; action = ACTION_FAIL; break; } - } else { - description = "Unhandled error code"; + } else action = ACTION_FAIL; - } if (action != ACTION_FAIL && - time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { + time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) action = ACTION_FAIL; - description = "Command timed out"; - } switch (action) { case ACTION_FAIL: /* Give up and fail the remainder of the request */ if (!(req->cmd_flags & REQ_QUIET)) { - if (description) - scmd_printk(KERN_INFO, cmd, "%s\n", - description); scsi_print_result(cmd); if (driver_byte(result) & DRIVER_SENSE) scsi_print_sense("", cmd); -- 2.7.4