The patch
ASoC: pcm: Sync delayed work before releasing resources
has been applied to the asoc tree at
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying to this mail.
Thanks, Mark
From 5d61f0ba6524dcbad198126e5793157c8afdea91 Mon Sep 17 00:00:00 2001
From: Takashi Iwai tiwai@suse.de Date: Fri, 25 Aug 2017 12:04:07 +0200 Subject: [PATCH] ASoC: pcm: Sync delayed work before releasing resources
When ASoC driver is unbound dynamically during its operation (i.e. a kind of hot-unplug), we may hit Oops due to the resource access after the release by a delayed work, something like:
Unable to handle kernel paging request at virtual address dead000000000220 .... PC is at soc_dapm_dai_stream_event.isra.14+0x20/0xd0 LR is at snd_soc_dapm_stream_event+0x74/0xa8 .... [<ffff000008715610>] soc_dapm_dai_stream_event.isra.14+0x20/0xd0 [<ffff00000871989c>] snd_soc_dapm_stream_event+0x74/0xa8 [<ffff00000871b23c>] close_delayed_work+0x3c/0x50 [<ffff0000080bbd6c>] process_one_work+0x1ac/0x318 [<ffff0000080bbf20>] worker_thread+0x48/0x420 [<ffff0000080c201c>] kthread+0xfc/0x128 [<ffff0000080842f0>] ret_from_fork+0x10/0x18
For fixing the race, this patch adds a sync-point in pcm private_free callback to finish the delayed work before actually releasing the resources.
Reported-by: Hiep Cao Minh cm-hiep@jinso.co.jp Reported-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com Tested-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/soc-pcm.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index 94b88b897c3b..c0f0b09cb433 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -2632,6 +2632,17 @@ static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream) return ret; }
+static void soc_pcm_private_free(struct snd_pcm *pcm) +{ + struct snd_soc_pcm_runtime *rtd = pcm->private_data; + struct snd_soc_platform *platform = rtd->platform; + + /* need to sync the delayed work before releasing resources */ + flush_delayed_work(&rtd->delayed_work); + if (platform->driver->pcm_free) + platform->driver->pcm_free(pcm); +} + /* create a new pcm */ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) { @@ -2757,7 +2768,7 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) } }
- pcm->private_free = platform->driver->pcm_free; + pcm->private_free = soc_pcm_private_free; out: dev_info(rtd->card->dev, "%s <-> %s mapping ok\n", (rtd->num_codecs > 1) ? "multicodec" : rtd->codec_dai->name,