linux-kernel - Re: [PATCH AUTOSEL 5.3 32/33] ALSA: hda: Add codec on bus address table lately

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Date:   Fri, 25 Oct 2019 16:09:53 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.3 32/33] ALSA: hda: Add codec on bus address table lately

On Fri, 25 Oct 2019 15:55:04 +0200,
Sasha Levin wrote:
> 
> From: Takashi Iwai <tiwai@...e.de>
> 
> [ Upstream commit ee5f85d9290fe25d460bd320b7fe073075d72d33 ]
> 
> The call of snd_hdac_bus_add_device() is needed only for registering
> the codec onto the bus caddr_tbl[] that is referred essentially only
> in the unsol event handler.  That is, the reason of this call and the
> release by the counter-part function snd_hdac_bus_remove_device() is
> just to assure that the unsol event gets notified to the codec.
> 
> But the current implementation of the unsol notification wouldn't work
> properly when the codec is still in a premature init state.  So this
> patch tries to work around it by delaying the caddr_tbl[] registration
> at the point of snd_hdac_device_register().
> 
> Also, the order of snd_hdac_bus_remove_device() and device_del() calls
> are shuffled to make sure that the unsol event is masked before
> deleting the device.
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204565
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

Please drop this.  This was reverted in the later commit.

And this is a deja vu, the AUTOSEL seems constantly picking it up.
Sasha, can you add a blacklist for avoiding it for future...?


thanks,

Takashi

> ---
>  sound/hda/hdac_device.c | 21 ++++++++++++---------
>  1 file changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
> index b26cc93e7e103..033bcef8751a8 100644
> --- a/sound/hda/hdac_device.c
> +++ b/sound/hda/hdac_device.c
> @@ -61,10 +61,6 @@ int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
>  	pm_runtime_get_noresume(&codec->dev);
>  	atomic_set(&codec->in_pm, 0);
>  
> -	err = snd_hdac_bus_add_device(bus, codec);
> -	if (err < 0)
> -		goto error;
> -
>  	/* fill parameters */
>  	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
>  					      AC_PAR_VENDOR_ID);
> @@ -143,15 +139,22 @@ int snd_hdac_device_register(struct hdac_device *codec)
>  	err = device_add(&codec->dev);
>  	if (err < 0)
>  		return err;
> +	err = snd_hdac_bus_add_device(codec->bus, codec);
> +	if (err < 0)
> +		goto error;
>  	mutex_lock(&codec->widget_lock);
>  	err = hda_widget_sysfs_init(codec);
>  	mutex_unlock(&codec->widget_lock);
> -	if (err < 0) {
> -		device_del(&codec->dev);
> -		return err;
> -	}
> +	if (err < 0)
> +		goto error_remove;
>  
>  	return 0;
> +
> + error_remove:
> +	snd_hdac_bus_remove_device(codec->bus, codec);
> + error:
> +	device_del(&codec->dev);
> +	return err;
>  }
>  EXPORT_SYMBOL_GPL(snd_hdac_device_register);
>  
> @@ -165,8 +168,8 @@ void snd_hdac_device_unregister(struct hdac_device *codec)
>  		mutex_lock(&codec->widget_lock);
>  		hda_widget_sysfs_exit(codec);
>  		mutex_unlock(&codec->widget_lock);
> -		device_del(&codec->dev);
>  		snd_hdac_bus_remove_device(codec->bus, codec);
> +		device_del(&codec->dev);
>  	}
>  }
>  EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);
> -- 
> 2.20.1
>