linux-kernel - Re: [PATCH] dmatest: do not allow to interrupt ongoing tests

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Date:	Mon, 27 May 2013 10:11:07 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Will Deacon <will.deacon@....com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	viresh.kumar@...aro.org, djbw@...com
Subject: Re: [PATCH] dmatest: do not allow to interrupt ongoing tests

On Fri, 2013-05-24 at 23:55 +0200, Guennadi Liakhovetski wrote: 
> On Thu, 23 May 2013, Andy Shevchenko wrote:
> 
> > When user interrupts ongoing transfers the dmatest may end up with console
> > lockup, oops, or data mismatch. This patch prevents user to abort any ongoing
> > test.
> 
> Personally I would be against such a change. What about interrupting the 
> test with rmmod?
>  Is it still possible after this your patch or not? If not 
> - this doesn't seem like a good idea to me. Why don't we just fix those 
> bugs, that you're describing?

The behaviour of the module is returned to the same page by this patch
as it was before (w/o debugfs).

The user can interrupt tests by rmmod, but it will take time up to
timeout.

I appreciate if you can do a deeper analysis of what happened in
case Will reported.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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