linux-kernel - Re: [GIT PULL] sound updates for 4.19-rc1

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Message-ID: <CA+55aFxZDYTFKM4-e89_2SKHjHh_8RCZe7whKa2kCWRFk4mAdg@mail.gmail.com>
Date:   Wed, 15 Aug 2018 19:00:48 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] sound updates for 4.19-rc1

On Wed, Aug 15, 2018 at 6:27 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I have no idea _why_, but it's consistent, and it bisects down to
>
>   c647f806b8c2 "ALSA: hda - Allow multiple ADCs for mic mute LED controls"
>
> where the previous commit works fine, but that commit definitely
> causes the problem.

Hmm.

That commit changes the return value of the
snd_hda_gen_add_micmute_led(), but doesn't change any of the callers.

Now, almost no caller actually checks the return value.

Almost.

There is *one* caller that does, though:

sound/pci/hda/dell_wmi_helper.c:
  alc_fixup_dell_wmi()

And yes, the laptop that breaks is a Dell. An XPS13.

I bet that instead of reverting, I can just change that

                        (snd_hda_gen_add_micmute_led(codec,
                                                     dell_micmute_update) <= 0);

to test for "< 0" instead of "<= 0".

                Linus