linux-kernel - Re: [dmaengine] [Q] jiffies value does not increase in dma_sync

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Message-ID: <CACKLOr0sDkaEFFCaby6H1h3hofxJdDbr4LXaFMebGWZ-46EwiQ@mail.gmail.com>
Date:	Fri, 3 Feb 2012 10:43:02 +0100
From:	javier Martin <javier.martin@...ta-silicon.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [dmaengine] [Q] jiffies value does not increase in dma_sync_wait()

On 3 February 2012 10:24, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Feb 03, 2012 at 10:22:00AM +0100, javier Martin wrote:
>> Hi Russell,
>>
>> On 3 February 2012 10:10, Russell King - ARM Linux
>> <linux@....linux.org.uk> wrote:
>> > On Fri, Feb 03, 2012 at 09:37:48AM +0100, javier Martin wrote:
>> >> I've introduced a couple of printk() to check why this timeout is not
>> >> triggered and I've found that the value of jiffies does not increase
>> >> between loop iterations (i. e. it's like time didn't advance).
>> >>
>> >> Does anyobody know what reasons could make jiffies not being updated?
>> >
>> > Are interrupts disabled?
>>
>> Apparently not but, how could I check it for sure? Is
>> "irqs_disabled()" suitable for that purpose?
>
> Yes.

"irqs_disabled()" returns 0 in every iteration of the loop. So I guess
this means IRQs are properly enabled, but jiffies keeps being fixed.


-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
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39005- Santander. Cantabria. Spain
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