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scsi: add DID_REQUEUE to the error handling

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We have a DID_IMM_RETRY to require a retry at once, but we could do with
a DID_REQUEUE to instruct the mid-layer to treat this command in the
same manner as QUEUE_FULL or BUSY (i.e. halt the submission until
another command returns ... or the queue pressure builds if there are no
outstanding commands).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
2005-04-12 17:49:09 -05:00 committed by James Bottomley
parent 6f71d9bc02
commit bf341919db
2 changed files with 5 additions and 0 deletions
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3
drivers/scsi/scsi_error.c
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@ -1306,6 +1306,9 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
case DID_IMM_RETRY: case DID_IMM_RETRY:
return NEEDS_RETRY; return NEEDS_RETRY;
case DID_REQUEUE:
return ADD_TO_MLQUEUE;
case DID_ERROR: case DID_ERROR:
if (msg_byte(scmd->result) == COMMAND_COMPLETE && if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
status_byte(scmd->result) == RESERVATION_CONFLICT) status_byte(scmd->result) == RESERVATION_CONFLICT)

2
include/scsi/scsi.h
View file

@ -295,6 +295,8 @@ struct scsi_lun {
#define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */ #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
#define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */ #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
#define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */ #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
#define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
* without decrementing the retry count */
#define DRIVER_OK 0x00 /* Driver status */ #define DRIVER_OK 0x00 /* Driver status */
/* /*