linux-kernel - Re: 2.6.21-mm1: many processes end up in D state

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Date:	Sun, 6 May 2007 01:46:54 +0200 (MEST)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	htejun@...il.com, mikpe@...uu.se
Cc:	akpm@...l.org, jgarzik@...ox.com, jirislaby@...il.com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: 2.6.21-mm1: many processes end up in D state

On Sat, 05 May 2007 17:30:51 +0200, Tejun Heo wrote:
> Mikael Pettersson wrote:
> >> I.e. no freezing of ports...
> > 
> > Your patch to delete the 'return 1;' on error is correct,
> > and makes the code match exactly the behaviour of previous
> > versions of sata_promise, except for the additional error
> > decoding.
> > 
> > ahci and sata_sil24 do the return in this situation. I don't
> > yet understand why they can get away with it while sata_promise
> > cannot, but for now the return should be removed.
> 
> That's because sata_sil24 and ahci call either ata_port_abort() or
> ata_port_freeze() prior to finishing error_intr routine.  Both functions
> abort all in-flight command and schedule EH.

Ah. Thanks, that clarifies things.

Jiri: please test the patch below instead. That is, revert to
the original code _with_ the 'return 1;', and then add this
patch to it. It should have pretty much the same effect as
removing the 'return 1;', however calling ata_port_abort()
is more in line with libata's new-style error handling.

/Mikael

--- linux-2.6.21-mm1/drivers/ata/sata_promise.c.~1~	2007-05-05 22:24:41.000000000 +0200
+++ linux-2.6.21-mm1/drivers/ata/sata_promise.c	2007-05-05 22:25:21.000000000 +0200
@@ -653,6 +653,8 @@ static void pdc_error_intr(struct ata_po
 	qc->err_mask |= ac_err_mask;
 
 	pdc_reset_port(ap);
+
+	ata_port_abort(ap);
 }
 
 static inline unsigned int pdc_host_intr( struct ata_port *ap,
-
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