Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755569Ab2BCJnM (ORCPT ); Fri, 3 Feb 2012 04:43:12 -0500 Received: from mail-we0-f174.google.com ([74.125.82.174]:35474 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752846Ab2BCJnE (ORCPT ); Fri, 3 Feb 2012 04:43:04 -0500 MIME-Version: 1.0 In-Reply-To: <20120203092456.GJ889@n2100.arm.linux.org.uk> References: <20120203091038.GI889@n2100.arm.linux.org.uk> <20120203092456.GJ889@n2100.arm.linux.org.uk> Date: Fri, 3 Feb 2012 10:43:02 +0100 Message-ID: Subject: Re: [dmaengine] [Q] jiffies value does not increase in dma_sync_wait() From: javier Martin To: Russell King - ARM Linux Cc: linux-kernel@vger.kernel.org, Vinod Koul , Dan Williams , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1331 Lines: 38 On 3 February 2012 10:24, Russell King - ARM Linux 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 >> 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 Avda de los Castros s/n 39005- Santander. Cantabria. Spain +34 942 25 32 60 www.vista-silicon.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/