lkml.org 
[lkml]   [2001]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectPATCH: sym53c8xxx.c timer handling
Gerard, LKML

The attached patch tweaks the sym53c8xx timeout timer handling a bit.

Is it correct?

It works with interrupts off (we need a reboot notifier to iterate the
hosts list, with IRQs off) and doesn't delay() 5 seconds in worst case.

Is there any reason this patch won't work? It seems OK to me.

Tim

--
Tim Hockin
Systems Software Engineer
Sun Microsystems, Cobalt Server Appliances
thockin@sun.com--- /home/users/admin/C26/III/linux-2.2/drivers/scsi/sym53c8xx.c Tue May 15 19:14:48 2001
+++ /usr/src/linux/drivers/scsi/sym53c8xx.c Wed May 16 22:52:12 2001
@@ -2265,7 +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
@@ -5884,7 +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
@@ -7244,20 +7248,17 @@

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.
@@ -8613,23 +8614,11 @@
{
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
\
 
 \ /
  Last update: 2005-03-22 12:53    [W:0.062 / U:5.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site