linux-kernel - Re: [PATCH v3 1/2] Staging: comedi: convert while loops to timeouts in s626.c

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Date:	Tue, 11 Mar 2014 14:26:32 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	Chase Southwood <chase.southwood@...oo.com>,
	gregkh@...uxfoundation.org
CC:	hsweeten@...ionengravers.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] Staging: comedi: convert while loops to timeouts
 in s626.c

On 2014-03-09 04:00, Chase Southwood wrote:
> This patch changes a handful of while loops to timeouts to prevent
> infinite looping on hardware failure. A couple such loops are in a
> function (s626_debi_transfer()) which is called from critical sections,
> so comedi_timeout() is unusable for them, and an iterative timeout is
> used instead. For the while loops in a context where comedi_timeout() is
> allowed, a new callback function, s626_send_dac_eoc(), has been defined
> to evaluate the conditions that the while loops are testing.  The new
> callback employs a switch statement based on a simple new enum so that
> it is usable for all of the different conditions tested in while loops
> in s626_send_dac().  The proper comedi_timeout() calls are then used.
>
> Signed-off-by: Chase Southwood <chase.southwood@...oo.com>
> ---
> Ian, here is a version of this patchset employing the enum you recommended.
> The second patch has been rebased on top of this one.
>
> 2: Used comedi_timeout() where appropriate, introduce callback function
>
> 3: Updated callback to switch on new enum.

Reviewed-by: Ian Abbott <abbotti@....co.uk>

For future reference, for patches affecting a single comedi driver, we 
usually title the patches like this:

staging: comedi: name_of_driver: summary of patch

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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