From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [BUG] ide dma_timer_expiry, then hard lockup Date: Tue, 19 Jun 2007 18:24:38 +0400 Message-ID: <4677E726.1080602@ru.mvista.com> References: <20070618175713.GD5836@austin.ibm.com> <20070618212704.394912b8@the-village.bc.nu> <20070618204601.GF5836@austin.ibm.com> <20070618220441.3a3af8ca@the-village.bc.nu> <4677E3BC.3040307@ru.mvista.com> <20070619151919.79c79af1@the-village.bc.nu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from h155.mvista.com ([63.81.120.155]:37739 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752516AbXFSOWz (ORCPT ); Tue, 19 Jun 2007 10:22:55 -0400 In-Reply-To: <20070619151919.79c79af1@the-village.bc.nu> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Linas Vepstas , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Alan Cox wrote: >>>>I can prepare a patch, but only with a lot of guidance. I can test >>>>& debug, I'm highly motivated just right now ... >>>If you've got a nice repeatable problem please try using the libata >>>driver. That handles the error paths differently and doesn't try a FIFO >>>drain which might matter in this case I guess. >> FIFO drain for DMA commands? > Welcome to the old IDE layer which I am so glad I left behind 8) > ide_ata_error will try and do a PIO flush regardless of the command type > if DRQ_STAT is asserted. See ide_dma_intr -> ide_error -> ... Indeed... but the thing is we don't know what's asserted in this case -- remember, it's reading the status register that locks everything up... > Alan MBR, Sergei