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[PATCH] scsi: remove meaningless scsi_cmnd->serial_number_at_timeout field

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scsi_cmnd->serial_number_at_timeout doesn't serve any purpose
anymore.  All serial_number == serial_number_at_timeout tests
are always true in abort callbacks.  Kill the field.  Also, as
->pid always equals ->serial_number and ->serial_number
doesn't have any special meaning anymore, update comments
above ->serial_number accordingly.  Once we remove all uses of
this field from all lldd's, this field should go.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
2005-04-03 14:59:11 -05:00
committed by James Bottomley
parent d3a933dc98
commit c6295cdf65
10 changed files with 15 additions and 62 deletions
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22
include/scsi/scsi_cmnd.h
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@@ -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;