diff options
Diffstat (limited to 'include/scsi/scsi_cmnd.h')
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index ae45d6f8f98..07f5c699eaa 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -43,21 +43,17 @@ struct scsi_cmnd { void (*done) (struct scsi_cmnd *); /* Mid-level done function */ /* - * A SCSI Command is assigned a nonzero serial_number when internal_cmnd - * passes it to the driver's queue command function. The serial_number - * is cleared when scsi_done is entered indicating that the command has - * been completed. If a timeout occurs, the serial number at the moment - * of timeout is copied into serial_number_at_timeout. By subsequently - * comparing the serial_number and serial_number_at_timeout fields - * during abort or reset processing, we can detect whether the command - * has already completed. This also detects cases where the command has - * completed and the SCSI Command structure has already being reused - * for another command, so that we can avoid incorrectly aborting or - * resetting the new command. - * The serial number is only unique per host. + * A SCSI Command is assigned a nonzero serial_number before passed + * to the driver's queue command function. The serial_number is + * cleared when scsi_done is entered indicating that the command + * has been completed. It currently doesn't have much use other + * than printk's. Some lldd's use this number for other purposes. + * It's almost certain that such usages are either incorrect or + * meaningless. Please kill all usages other than printk's. Also, + * as this number is always identical to ->pid, please convert + * printk's to use ->pid, so that we can kill this field. */ unsigned long serial_number; - unsigned long serial_number_at_timeout; int retries; int allowed; |