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Subject[PATCH] sym53c8xx timer rework
Gerard (and all)

Attached is a small patch to re-work the timer in the sym53c8xx driver. I
submitted this patch against 2.4.5, but don't see it in 2.4.6, so I am
re-submitting against 2.4.6.

Please let me know if there are any problems with this patch.

--
Tim Hockin
Systems Software Engineer
Sun Microsystems, Cobalt Server Appliances
thockin@sun.comdiff -ruN dist-2.4.6/drivers/scsi/sym53c8xx.c cobalt-2.4.6/drivers/scsi/sym53c8xx.c
--- dist-2.4.6/drivers/scsi/sym53c8xx.c Tue Jun 12 11:06:54 2001
+++ cobalt-2.4.6/drivers/scsi/sym53c8xx.c Mon Jul 9 11:04:14 2001
@@ -2249,7 +2265,6 @@
**----------------------------------------------------------------
*/
struct usrcmd user; /* Command from user */
- volatile u_char release_stage; /* Synchronisation stage on release */

/*----------------------------------------------------------------
** Fields that are used (primarily) for integrity check
@@ -5868,7 +5883,12 @@
** start the timeout daemon
*/
np->lasttime=0;
- ncr_timeout (np);
+#ifdef SCSI_NCR_PCIQ_BROKEN_INTR
+ np->timer.expires = ktime_get((HZ+9)/10);
+#else
+ np->timer.expires = ktime_get(SCSI_NCR_TIMER_INTERVAL);
+#endif
+ add_timer(&np->timer);

/*
** use SIMPLE TAG messages by default
@@ -7227,23 +7247,19 @@
**==========================================================
*/

-#ifdef MODULE
static int ncr_detach(ncb_p np)
{
- int i;
+ unsigned long flags;

printk("%s: detaching ...\n", ncr_name(np));

/*
-** Stop the ncr_timeout process
-** Set release_stage to 1 and wait that ncr_timeout() set it to 2.
+** Stop the ncr_timeout process - lock it to ensure no timer is running
+** on a different CPU, or anything
*/
- np->release_stage = 1;
- for (i = 50 ; i && np->release_stage != 2 ; i--) MDELAY (100);
- if (np->release_stage != 2)
- printk("%s: the timer seems to be already stopped\n",
- ncr_name(np));
- else np->release_stage = 2;
+ NCR_LOCK_NCB(np, flags);
+ del_timer(&np->timer);
+ NCR_UNLOCK_NCB(np, flags);

/*
** Reset NCR chip.
@@ -7273,7 +7289,6 @@

return 1;
}
-#endif

/*==========================================================
**
@@ -8600,23 +8615,11 @@
{
u_long thistime = ktime_get(0);

- /*
- ** If release process in progress, let's go
- ** Set the release stage from 1 to 2 to synchronize
- ** with the release process.
- */
-
- if (np->release_stage) {
- if (np->release_stage == 1) np->release_stage = 2;
- return;
- }
-
#ifdef SCSI_NCR_PCIQ_BROKEN_INTR
- np->timer.expires = ktime_get((HZ+9)/10);
+ mod_timer(&np->timer, ktime_get((HZ+9)/10));
#else
- np->timer.expires = ktime_get(SCSI_NCR_TIMER_INTERVAL);
+ mod_timer(&np->timer, ktime_get(SCSI_NCR_TIMER_INTERVAL));
#endif
- add_timer(&np->timer);

/*
** If we are resetting the ncr, wait for settle_time before
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