linux-kernel - Re: [PATCH] dma/coh901318: use simple_read_from

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Date:	Fri, 22 Oct 2010 21:16:31 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Nicolas Kaiser <nikai@...ai.net>,
	Per Friden <per.friden@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma/coh901318: use simple_read_from_buffer

On Friday 22 October 2010 20:30:39 Nicolas Kaiser wrote:
> * Arnd Bergmann <arnd@...db.de>:
> > On Friday 22 October 2010 19:29:53 Nicolas Kaiser wrote:
> > > If copy_to_user fails, the assigned error code instantly gets
> > > overwritten, and the failure apparently ignored. Moreover,
> > > shouldn't the error code be -EFAULT instead of -EINVAL?
> > 
> > Looks good, but it would be even better to just use
> > simple_read_from_buffer in this function, which takes care of
> > a lot the other complexities as well.
> 
> Like this? (Sorry, untested.)
> 
> Signed-off-by: Nicolas Kaiser <nikai@...ai.net>

Yes, exactly. For stable kernels, your smaller fix is probably good
enough though and it's obviously correct.

	Arnd
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