Re: [PATCH 1/4] ALSA: hda/realtek: fix mute/micmute LEDs for HP 855 G8

[Alexander Sergeyev <sergeev917@gmail.com>]

On Wed, Jan 19, 2022 at 10:12:43AM +0100, Takashi Iwai wrote:
> > Actually, the timing issues are present here as well. Sometimes unbind & 
> > bind works fine. But fails on the second round.
>
> Here "fails" means the kernel Oops / crash?  If yes, the back trace
> would be helpful.

No, I mean "IO_PAGE_FAULT" and "out of range cmd" don't appear on every unbind 
& bind. Sometimes it works cleanly.

Backtraces for the source of "out of range cmd" messages:

--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -231,6 +231,7 @@ static unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
            (verb & ~0xfff) || (parm & ~0xffff)) {
                dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
                        addr, nid, verb, parm);
+               dump_stack();
                return -1;
        }

give me the following:

snd_hda_codec_realtek hdaudioC1D0: out of range cmd 0:20:400:90170118
Workqueue: events set_brightness_delayed
Call Trace:
 <TASK>
 dump_stack_lvl+0x34/0x4c
 snd_hdac_make_cmd.cold+0x17/0x2c
 snd_hdac_codec_write+0x16/0x60
 coef_mute_led_set+0x3a/0x60
 set_brightness_delayed+0x6f/0xb0
 process_one_work+0x1e1/0x380
 worker_thread+0x4e/0x3b0
 ? rescuer_thread+0x370/0x370
 kthread+0x145/0x170
 ? set_kthread_struct+0x50/0x50
 ret_from_fork+0x22/0x30
 </TASK>

I'll have more time to look into this deeper later this week.