linux-kernel - Re: [PATCH 5/5] staging: hv: Gracefully handle SCSI resets

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Message-ID: <20100902200839.GD16897@kroah.com>
Date:	Thu, 2 Sep 2010 13:08:39 -0700
From:	Greg KH <greg@...ah.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Hank Janssen <hjanssen@...ltheuniverse.com>,
	devel@...verdev.osuosl.org, virtualization@...ts.osdl.org,
	haiyangz@...rosoft.com, gregkh@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] staging: hv: Gracefully handle SCSI resets - RESEND

On Wed, Sep 01, 2010 at 09:28:53AM -0700, Joe Perches wrote:
> On Tue, 2010-08-31 at 11:22 -0700, Hank Janssen wrote:
> > If we get a SCSI host bus reset we now gracefully handle it, and we 
> > take the device offline. This before sometimes caused hangs.
> > ---
> >  drivers/staging/hv/storvsc.c |   36 +++++++++++++++++++++++++++++++++++-
> []
> > +	/*
> > +	 * Wait for traffic in transit to complete
> > +	 */
> > +	while (atomic_read(&storDevice->NumOutstandingRequests))
> > +		udelay(1000);
> > +
> 
> Is it useful to have a maximum check or timeout?
> Maybe use usleep_range?

Yeah, that's not good, you need to have some way to get out of here in
case something bad happens and that number never goes down.

Why not just use a completion function instead of a busy loop?

thanks,

greg k-h
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