From mboxrd@z Thu Jan  1 00:00:00 1970
From: b_lkasam@codeaurora.org
Subject: Re: ASoC Compress FE open causing warning
Date: Wed, 17 Jan 2018 15:08:31 +0530
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hi ALSA team,
Please comment on below issue wrt warning seen..

thanks
Laxminath Kasam
On 2018-01-10 15:00, b_lkasam@codeaurora.org wrote:
> Hi ALSA team,
> This is wrt soc_compr_open_fe() call result in warning in API
> triggered from it snd_soc_runtime_activate(fe, stream)..
> Due to lock taken is &fe->card->mutex, but expected to take 
> &fe->pcm_mutex.
> Below line results in warning since pcm_mutex lock is not taken..
> 
> void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int 
> stream)
> {
>    ...
> 	lockdep_assert_held(&rtd->pcm_mutex);
> 
> }
> 
> Warning seen as below ->
> <4>[ 263.555973] [3: writer: 8681] WARNING: CPU: 3 PID: 8681 at
> /home/min47.lee/ext-drive/j8plus-oos/android/kernel/sound/soc/soc-pcm.c:71
> snd_soc_runtime_activate+0x11c/0x130()
> <6>[ 263.572125] [3: writer: 8681] Modules linked in:
> <6>[ 263.572176] [3: writer: 8681] CPU: 3 PID: 8681 Comm: writer
> Tainted: G W 3.18.71-g9888952 #3
> <6>[ 263.572253] [3: writer: 8681] Hardware name: Samsung J8-Plus LTE
> EUR OPEN Rev01 (DT)
> <0>[ 263.572317] [3: writer: 8681] Call trace:
> <6>[ 263.576842] [3: writer: 8681] [<ffffffc00008aae4>] 
> dump_backtrace+0x0/0x15c
> <6>[ 263.576904] [3: writer: 8681] [<ffffffc00008ac54>] 
> show_stack+0x14/0x1c
> <6>[ 263.576966] [3: writer: 8681] [<ffffffc0011a1cb0>] 
> dump_stack+0x80/0xa4
> <6>[ 263.577025] [3: writer: 8681] [<ffffffc0000a6bf0>]
> warn_slowpath_common+0x88/0xac
> <6>[ 263.577088] [3: writer: 8681] [<ffffffc0000a6d2c>]
> warn_slowpath_null+0x18/0x20
> <6>[ 263.577152] [3: writer: 8681] [<ffffffc000f0141c>]
> snd_soc_runtime_activate+0x11c/0x130
> <6>[ 263.577221] [3: writer: 8681] [<ffffffc000f05e74>]
> soc_compr_open_fe+0x204/0x29c
> <6>[ 263.577289] [3: writer: 8681] [<ffffffc000eddbac>]
> snd_compr_open+0x170/0x1b4
> <6>[ 263.577355] [3: writer: 8681] [<ffffffc000ebfc78>] 
> snd_open+0x13c/0x154
> <6>[ 263.577415] [3: writer: 8681] [<ffffffc0001d72e8>] 
> chrdev_open+0x140/0x188
> <6>[ 263.577476] [3: writer: 8681] [<ffffffc0001d0758>]
> do_dentry_open+0x260/0x2d8
> <6>[ 263.577545] [3: writer: 8681] [<ffffffc0001d1938>] 
> vfs_open+0x60/0x6c
> <6>[ 263.577605] [3: writer: 8681] [<ffffffc0001e0ea8>] 
> do_last+0x804/0xb3c
> <6>[ 263.577665] [3: writer: 8681] [<ffffffc0001e141c>] 
> path_openat+0x23c/0x5f4
> <6>[ 263.577732] [3: writer: 8681] [<ffffffc0001e2108>] 
> do_filp_open+0x40/0xa8
> <6>[ 263.577796] [3: writer: 8681] [<ffffffc0001d1cf4>] 
> do_sys_open+0x174/0x224
> <6>[ 263.577866] [3: writer: 8681] [<ffffffc0002212f4>]
> compat_SyS_openat+0xc/0x14
> 
> 
> 
> With Regards,
> Laxminath Kasam