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Message-ID: <20090602155153.GA14121@beardog.cca.cpqcorp.net>
Date: Tue, 2 Jun 2009 10:51:53 -0500
From: "Mike Miller (OS Dev)" <mikem@...rdog.cca.cpqcorp.net>
To: Jens Axboe <jens.axboe@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
scameron@...rdog.cca.cpqcorp.net, linux-kernel@...r.kernel.org,
linux-scsi@...r.kernel.org
Subject: Re: [PATCH 2/2] cciss: Fix SCSI device reset handler
On Tue, Jun 02, 2009 at 02:50:11PM +0200, Jens Axboe wrote:
> On Fri, May 29 2009, Andrew Morton wrote:
> > On Wed, 27 May 2009 15:30:07 -0500
> > scameron@...rdog.cca.cpqcorp.net wrote:
> >
> > > +static int wait_for_device_to_become_ready(ctlr_info_t *h,
> > > + unsigned char lunaddr[])
> > > +{
> > > + int rc;
> > > + int count = 0;
> > > + int waittime = HZ;
> > > + CommandList_struct *c;
> > > +
> > > + c = cmd_alloc(h, 1);
> > > + if (!c) {
> > > + printk(KERN_WARNING "cciss%d: out of memory in "
> > > + "wait_for_device_to_become_ready.\n", h->ctlr);
> > > + return IO_ERROR;
> > > + }
> > > +
> > > + /* Send test unit ready until device ready, or give up. */
> > > + while (count < 20) {
> > > +
> > > + /* Wait for a bit. do this first, because if we send
> > > + * the TUR right away, the reset will just abort it.
> > > + */
> > > + set_current_state(TASK_INTERRUPTIBLE);
> > > + schedule_timeout(waittime);
> >
> > That's schedule_timeout_interruptible().
> >
> > The problem with interruptible sleeps of this nature is that they are
> > no-ops if the calling process happens to have signal_pending(). I
> > suspect that this condition will break your driver.
> >
> > If so, switching to schedule_timeout_uninterruptible() will unbreak it.
>
> I added Stephens patch and your fixup.
>
> --
> Jens Axboe
>
Thanks, Jens.
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