Re: [PATCH] ALSA: hda/realtek: add missing error checks in alc269 init/shutdown

[Takashi Iwai <tiwai@suse.de>]

On Wed, 29 Jul 2026 08:38:03 +0200,
songxiebing wrote:
> 
> From: Bob Song <songxiebing@kylinos.cn>
> 
> alc_read_coef_idx() and alc_read_coefex_idx() can return -1 on error
> via snd_hda_codec_read(). Several init and shutdown functions save these
> return values and later write them back to hardware registers without
> checking for errors, potentially corrupting COEF register state on a
> read failure.
> 
> Add error checks in:
> - alc282_init() and alc282_shutup(): check coef78 before write-back
> - alc285_hp_init(): check coef38/coef0d/coef36 before update, check
>   val before write-back, and break polling loop on error
> - alc294_hp_init(): break polling loop on read error
> 
> Also add a missing NULL check for codec->bus->pci in alc269_probe()
> before dereferencing it, consistent with the existing checks in the
> same function.
> 
> Signed-off-by: Bob Song <songxiebing@kylinos.cn>

Could you split the NULL check to another patch?  Basically it's a
completely different sort of fix from others.


thanks,

Takashi