linux-kernel - Re: [PATCH] Staging: comedi: add timeouts to while loops in s626.c

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Message-ID: <1393733614.99805.YahooMailNeo@web164001.mail.gq1.yahoo.com>
Date:	Sat, 1 Mar 2014 20:13:34 -0800 (PST)
From:	Chase Southwood <chase.southwood@...oo.com>
To:	Chase Southwood <chase.southwood@...oo.com>,
	Ian Abbott <abbotti@....co.uk>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc:	Ian Abbott <ian.abbott@....co.uk>,
	"hsweeten@...ionengravers.com" <hsweeten@...ionengravers.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Staging: comedi: add timeouts to while loops in s626.c

>On Friday, February 28, 2014 11:49 PM, Chase Southwood <chase.southwood@...oo.com> wrote:

>>On Friday, February 28, 2014 11:26 AM, Ian Abbott <abbotti@....co.uk> wrote:
>>>On 2014-02-28 07:35, Chase Southwood wrote:

[snip]

>>In the case of s626_send_dac(), it doesn't seem to be used in any 
>>critical sections, so it could make use of Hartley's comedi_timeout().
>>
>>Some of the timeout errors could be propagated, especially for 
>>s626_send_dac() which is only reachable from very few paths.
>
>
>Awesome, I'll swap all of my timeouts out for comedi_timeout() in s626_send_dac().

Actually, after taking another look at this, I don't think that using comedi_timeout()
here is going to work, actually.
The context from which s626_send_dac() is called allows sleep all right, but readl() isn't
a comedi function and therefore it doesn't behave (in parameters or return values) as
the callback function parameter to comedi_timeout() requires.  So unless I'm missing
something particularly large here, I believe we'll have to do the timeouts here manually
as well.  Am I correct here, and if so, would you like the iteration based timeouts here
as well, or a sleep-based timeout similar to that employed by comedi_timeout()?

Thanks,
Chase
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