linux-kernel - Re: [PATCH 2/2] cciss: Fix SCSI device reset handler

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Message-ID: <20090602125011.GJ11363@kernel.dk>
Date:	Tue, 2 Jun 2009 14:50:11 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	scameron@...rdog.cca.cpqcorp.net, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, mikem@...rdog.cca.cpqcorp.net
Subject: Re: [PATCH 2/2] cciss: Fix SCSI device reset handler

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

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