Hi,
This is a resend of a patch I proposed in the
"[BUG] 2.6.15-rc1, soft lockup detected while probing IDE devices on AMD7441"
thread.
I recieved no ACK/NACK or other feedback on the patch, so I'm resending it in
the hope of getting some comments :)
From: Jesper Juhl <[email protected]>
Make sure we touch the softlockup watchdog in
ide_wait_not_busy() since it may cause the watchdog to trigger, but
there's really no point in that since the loop will eventually return, and
triggering the watchdog won't do us any good anyway.
The if (!(timeout % 128)) bit is a guess that since
touch_softlockup_watchdog() is a per_cpu thing it will be cheaper to do the
modulo calculation than calling the function every time through the loop,
especially as the nr of CPU's go up. But it's purely a guess, so I may very
well be wrong - also, 128 is an arbitrarily chosen value, it's just a nice
number that'll give us <10 function calls pr second.
Since I have no IDE devices in my box I'm unable to test this beyond making
sure it compiles without warnings or errors (which it does).
Let me know what you think.
Signed-off-by: Jesper Juhl <[email protected]>
---
drivers/ide/ide-iops.c | 8 ++++++++
1 files changed, 8 insertions(+)
diff -up linux-2.6.15-rc3-orig/drivers/ide/ide-iops.c linux-2.6.15-rc3/drivers/ide/ide-iops.c
--- linux-2.6.15-rc3-orig/drivers/ide/ide-iops.c 2005-11-29 15:30:32.000000000 +0100
+++ linux-2.6.15-rc3/drivers/ide/ide-iops.c 2005-11-29 15:44:23.000000000 +0100
@@ -24,6 +24,7 @@
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/bitops.h>
+#include <linux/sched.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
@@ -1243,6 +1244,13 @@ int ide_wait_not_busy(ide_hwif_t *hwif,
*/
if (stat == 0xff)
return -ENODEV;
+
+ /*
+ * We risk triggering the soft lockup detector, but we don't
+ * want that, so better poke it a bit once in a while.
+ */
+ if (!(timeout % 128))
+ touch_softlockup_watchdog();
}
return -EBUSY;
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]