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