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

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>

drivers/scsi/ips.c

@@ -833,13 +833,6 @@ ips_eh_abort(Scsi_Cmnd * SC)
 	if (!ha->active)
 		return (FAILED);
 
-	if (SC->serial_number != SC->serial_number_at_timeout) {
-		/* HMM, looks like a bogus command */
-		DEBUG(1, "Abort called with bogus scsi command");
-
-		return (FAILED);
-	}
-
 	/* See if the command is on the copp queue */
 	item = ha->copp_waitlist.head;
 	while ((item) && (item->scsi_cmd != SC))