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SubjectRe: [PATCH] SATA NCQ #4
On Thu, Jun 09 2005, Grant Coady wrote:
> On Wed, 8 Jun 2005 13:45:26 +0200, Jens Axboe <axboe@suse.de> wrote:
> >
> >Any chance you can log the boot process when it fails, using serial
> >console or something similar? At least write down the EIP of where it
> >fails :-)
>
> Guess what? I switched box on this morning with monitor off and
> the boot completed, 'cos I'd logged in much time later ssh. Didn't
> give it enough time yesterday :(
>
> I have one very large syslog... 139MB
>
> How much of that would you like :)
>
> Jun 9 04:27:45 sempro kernel: [<c0100ad3>] default_idle+0x23/0x30
> Jun 9 04:27:45 sempro kernel: [<c0100b58>] cpu_idle+0x48/0x60
> Jun 9 04:27:45 sempro kernel: [<c04867b8>] start_kernel+0x148/0x170
> Jun 9 04:27:45 sempro kernel: [<c04863a0>] unknown_bootoption+0x0/0x1b0
> Jun 9 04:27:45 sempro kernel: Badness in __ata_qc_complete at drivers/scsi/libata-core.c:3062

Ah duh, I never tested on UP, you have to use assert_spin_locked() there
not the direct spin_is_locked().

So your system was functioning just fine, you just got a warning for
every completed request slowing it down a lot :)

This should fix it. Jeff, can you apply that incremental to the ncq
branch? Thanks!

--- linux-2.6/drivers/scsi/libata-core.c~ 2005-06-09 08:20:34.000000000 +0200
+++ linux-2.6/drivers/scsi/libata-core.c 2005-06-09 08:22:24.000000000 +0200
@@ -3059,7 +3059,7 @@
struct ata_port *ap = qc->ap;
unsigned int tag, do_clear = 0;

- WARN_ON(!spin_is_locked(&ap->host_set->lock));
+ WARN_ON(!assert_spin_locked(&ap->host_set->lock));

if (likely(qc->flags & ATA_QCFLAG_ACTIVE)) {
assert(ap->queue_depth);
--
Jens Axboe

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