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To:     Wu Bo <wubo40@huawei.com>, alsa-devel@alsa-project.org
Cc:     linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org,
        Aaron Plattner <aplattner@nvidia.com>,
        Feilong Lin <linfeilong@huawei.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Kai Vehmanen <kai.vehmanen@linux.intel.com>,
        Libin Yang <libin.yang@linux.intel.com>,
        Nikhil Mahale <nmahale@nvidia.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Takashi Iwai <tiwai@suse.com>,
        Zhiqiang Liu <liuzhiqiang26@huawei.com>
Subject: Re: [PATCH] sound:hdmi:fix without unlocked before return
From:   Markus Elfring <Markus.Elfring@web.de>
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Date:   Sun, 26 Apr 2020 19:00:54 +0200
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> After add sanity check to pass klockwork check,
> The spdif_mutex should be unlock before return true
> in check_non_pcm_per_cvt().

How do you think about a wording variant like the following?

   Subject:
   [PATCH v2] ALSA: hda/hdmi: Unlock a mutex always before returning from =
check_non_pcm_per_cvt()

   Change description (according to a solution alternative):
   The exception handling was incomplete in an if branch for
   a null pointer check of the variable =E2=80=9Cspdif=E2=80=9D.
   Thus assign an appropriate value to the local variable =E2=80=9Cnon_pcm=
=E2=80=9D
   by using a conditional operator instead.
   A mutex is also appropriately unlocked then.


=E2=80=A6
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -1848,8 +1848,10 @@ static bool check_non_pcm_per_cvt(struct hda_code=
c *codec, hda_nid_t cvt_nid)
=E2=80=A6
> -	if (WARN_ON(spdif =3D=3D NULL))
> +	if (WARN_ON(spdif =3D=3D NULL)) {
> +		mutex_unlock(&codec->spdif_mutex);
>  		return true;
> +	}
>  	non_pcm =3D !!(spdif->status & IEC958_AES0_NONAUDIO);

-	if (WARN_ON(spdif =3D=3D NULL))
-		return true;
-	non_pcm =3D !!(spdif->status & IEC958_AES0_NONAUDIO);
+	non_pcm =3D WARN_ON(!spdif)
+		  ? true
+		  : !!(spdif->status & IEC958_AES0_NONAUDIO);
 	mutex_unlock(&codec->spdif_mutex);
 	return non_pcm;
 }


Would you like to add the tag =E2=80=9CFixes=E2=80=9D to the change descri=
ption?

Regards,
Markus