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

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Message-ID: <20120203092456.GJ889@n2100.arm.linux.org.uk>
Date:	Fri, 3 Feb 2012 09:24:56 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	javier Martin <javier.martin@...ta-silicon.com>
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 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.
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