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Tue, 3 Nov 2026 14:56:23 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id MVQrJxf26WoyGwAAD6G6ig (envelope-from ); Tue, 03 Nov 2026 14:56:23 +0000 Date: Tue, 03 Nov 2026 15:56:15 +0100 Message-ID: <87se1ivu9c.wl-tiwai@suse.de> From: Takashi Iwai To: =?ISO-8859-2?Q?Micha=B3_Kope=E6?= Cc: Takashi Iwai , Jaroslav Kysela , linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, piotr.krol@3mdeb.com, maciej.pijanowski@3mdeb.com Subject: Re: [PATCH] ALSA: hda/core: Stop capability walk on empty capability header In-Reply-To: <20261102114939.2182131-1-michal.kopec@3mdeb.com> References: <20261102114939.2182131-1-michal.kopec@3mdeb.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Level: X-Spamd-Result: default: False [-12.30 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCPT_COUNT_SEVEN(0.00)[7]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -12.30 On Mon, 02 Nov 2026 12:49:39 +0100, Micha³ Kopeæ wrote: > > From: Michal Kopec > > snd_hdac_bus_parse_capabilities() walks the controller's linked > capability list starting at LLCH. On some platforms one of the entries > reads back as all zeros. Such a header does not describe a capability, > but the walk still treats it as one: it falls into the default case and > reports an error, printing the raw register value instead of the > capability ID: > > snd_hda_intel 0000:00:1f.3: Unknown capability 0 > > The walk then stops anyway, because the next pointer of a zero header > is 0, so the message is only noise. > > Treat an all-zero header as the end of the list, the same way a failed > read (-1) is already handled, and log it at debug level only. Also > print the capability ID in hex for a genuinely unknown capability, > instead of the full header value. > > Fixes: 0b00a5615dc4 ("ALSA: hdac_ext: add hdac extended controller") > Signed-off-by: Micha³ Kopeæ Applied now. Thanks. Takashi