From patchwork Fri Mar 11 10:37:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Koul X-Patchwork-Id: 8564311 Return-Path: X-Original-To: patchwork-alsa-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 754BBC0553 for ; Fri, 11 Mar 2016 10:34:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 89B0920328 for ; Fri, 11 Mar 2016 10:34:16 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.kernel.org (Postfix) with ESMTP id 0E10C20114 for ; Fri, 11 Mar 2016 10:34:15 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id E64FF2606A9; Fri, 11 Mar 2016 11:34:13 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id CF11C261A5E; Fri, 11 Mar 2016 11:33:55 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 6572A261A5E; Fri, 11 Mar 2016 11:33:54 +0100 (CET) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by alsa0.perex.cz (Postfix) with ESMTP id 754C32606A9 for ; Fri, 11 Mar 2016 11:33:35 +0100 (CET) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga103.jf.intel.com with ESMTP; 11 Mar 2016 02:33:34 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,320,1455004800"; d="scan'208";a="921670943" Received: from vkoul-udesk7.iind.intel.com (HELO localhost) ([10.223.84.39]) by fmsmga001.fm.intel.com with ESMTP; 11 Mar 2016 02:33:31 -0800 Date: Fri, 11 Mar 2016 16:07:47 +0530 From: Vinod Koul To: Charles Keepax Message-ID: <20160311103747.GZ11154@localhost> References: <1457606694-10985-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> <20160311074843.GV11154@localhost> <20160311100425.GH1490@localhost.localdomain> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20160311100425.GH1490@localhost.localdomain> User-Agent: Mutt/1.5.21 (2010-09-15) Cc: alsa-devel@alsa-project.org, patches@opensource.wolfsonmicro.com, lgirdwood@gmail.com, tiwai@suse.com, broonie@kernel.org Subject: Re: [alsa-devel] [PATCH 1/4] ASoC: compress: Pass error out of soc_compr_pointer X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP On Fri, Mar 11, 2016 at 10:04:25AM +0000, Charles Keepax wrote: > On Fri, Mar 11, 2016 at 01:18:43PM +0530, Vinod Koul wrote: > > On Thu, Mar 10, 2016 at 10:44:51AM +0000, Charles Keepax wrote: > > > The soc_compr_pointer does not correctly pass any errors returned by the > > > driver callback back up the stack. This patch corrects this issue. > > > > Should we do that :) I am not too sure. Pointer query is supposed to read > > the current value and return. You are trying to indicate that stream has > > gone bad which is not the same as read faced an error... > > > > Also please use cover letter for these things to describe problem you are > > trying to solve. > > Apologies for not doing so, I had been viewing this as more of a > simple oversight in the framework rather than a design choice. > > The problem I am looking at is the DSP suffers an unrecoverable > error. We can find out about this error in our driver because the > DSP returns some error status to us. This is fine if user-space > is doing a read as reads return error status back to user-space > so the user can find out that things have gone bad. However, if > user-space is doing an avail request there is no path for the > error to come back up to user-space. The pointer request returns > zero available data, so a read never happens and we basically > just end up sitting waiting for data on a stream that we know > full well has died. So this confirms my hunch and we should then notify core of error by stopping the stream properly and then return error on poll/pointer query. So cna try this untested patch, whcih includes a hack for stopped state. We don't seem to have a stopped state in ALSA, that bit would need refinement -- >8 -- diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h index c0abcdc11470..a42c64248ad7 100644 --- a/include/sound/compress_driver.h +++ b/include/sound/compress_driver.h @@ -187,4 +187,5 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream) wake_up(&stream->runtime->sleep); } +int snd_compr_stop(struct snd_compr_stream *stream); #endif diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c index 18b8dc45bb8f..5b451a3af1a3 100644 --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -218,12 +218,22 @@ static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) return snd_compr_calc_avail(stream, &avail); } +#define SNDRV_PCM_STATE_STOP 8 + static int snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg) { struct snd_compr_avail ioctl_avail; size_t avail; + mutex_lock(&stream->device->lock); + if (stream->runtime->state == SNDRV_PCM_STATE_OPEN || + stream->runtime->state == SNDRV_PCM_STATE_STOP) { + mutex_unlock(&stream->device->lock); + return -EBADFD; + } + mutex_unlock(&stream->device->lock); + avail = snd_compr_calc_avail(stream, &ioctl_avail); ioctl_avail.avail = avail; @@ -386,7 +396,8 @@ static unsigned int snd_compr_poll(struct file *f, poll_table *wait) return -EFAULT; mutex_lock(&stream->device->lock); - if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) { + if (stream->runtime->state == SNDRV_PCM_STATE_OPEN || + stream->runtime->state == SNDRV_PCM_STATE_STOP) { retval = -EBADFD; goto out; } @@ -669,7 +680,7 @@ static int snd_compr_start(struct snd_compr_stream *stream) return retval; } -static int snd_compr_stop(struct snd_compr_stream *stream) +int snd_compr_stop(struct snd_compr_stream *stream) { int retval; @@ -684,6 +695,7 @@ static int snd_compr_stop(struct snd_compr_stream *stream) } return retval; } +EXPORT_SYMBOL_GPL(snd_compr_stop); static int snd_compress_wait_for_drain(struct snd_compr_stream *stream) {