On 03/22/2010 11:24 PM, Tejun Heo wrote:
Commit 27943620cbd960f710a385ff4a538e14ed3f1922 introduced spurious
IRQ handling but it has a race condition where valid completion can be
lost while trying to clear spurious IRQ leading to occassional command
timeouts.
This patch improves SFF interrupt handler such that
1. Once BMDMA HSM is stopped, the condition is never considered
spurious. As there's no way to resume stopped BMDMA HSM, if device
status doesn't agree with BMDMA status, the only way out is
aborting the command (otherwise, it will just end up timing out).
2. ap->ops->sff_check_status() can be safely called to clear spurious
device IRQ as it atomically returns completion status but BMDMA IRQ
status can't be cleared in safe way if command is in flight. After
a spurious IRQ, call ap->ops->sff_irq_clear() only if the
respective device is idle and retry completion if
sff_check_status() indicates command completion.
Please note that ata_piix uses bmdma_status for sff_irq_check() and #2
won't weaken spurious IRQ handling even with in-flight command because
if bmdma_status indicates IRQ pending but device status is not on
spurious check, the next IRQ handler invocation will abort the command
due to #1.
This fixes bko#15537.
https://bugzilla.kernel.org/show_bug.cgi?id=15537
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Andrew Benton <b3nton@xxxxxxxxx>
Cc: Petr Uzel <petr.uzel@xxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
---
hmmmm, could you resend this patch?
Neither git am nor patch(1) seem to like it...
Here it is. Puzzled, the original posting was whitespace corrupt (all
tabs were replaced with spaces) although I sent it exactly the same
way as other patches.
Still corrupted and not working... Because it is an important fix, I
manually applied it by recreating the patch, chunk by chunk.
Jeff
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
