From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AD474223DC6; Sat, 30 May 2026 17:46:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163186; cv=none; b=FepKPtGkDJCiZUsfQi2j8YhRFKrLP3ea2ev1HmGRjtyg5J+eYdPsusXui6r05m7xISvVUAnLP7rsDrz2EfyE5TtKHtAdAR1HbQ0++F4Xcc4AYzyKoqx3/S/uGl/jsgbcTE1Wh6gVt+9IW6QQvxRcIni70pVnXkf2gcMBw47TiGs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163186; c=relaxed/simple; bh=8QdHsQJ/P8IEAKj/4qeif9KQ9sw38RlDduxy3askZF4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Mws55t7g/SyCubKs0JXbLCYlFx4DB7HAnKcyAWNGBZz6DF8I+jmYfDnYtiX77R1R9dlJovlf8zC4FuxLOFNV1geyy+xrAaeiiV6dfB0MEmCuZ3c871a1ZYdanrLOgQItnFR/7xDi7/j1Mx/b6eaZIwm50T2/nnKniftwYv/YBxM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rJf+OYXN; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rJf+OYXN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE96B1F00893; Sat, 30 May 2026 17:46:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780163185; bh=wa4Lsk7qKCOMDEo6YwexRLuceZkZ5+D4KtAfW2BYC8w=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rJf+OYXNZzx1MmGsEvyRBoavlliew07od8pjcgpzUOrQwulrG0ZIowID3aFoLtx2N vCd87b1dMG1K1uGvkxae1mAdTK2GDxfcurgLlKLLbqaw35mUFTG1339hxYxS+xW7jk bb30Xd5dfWh93pqgtEh8U/1OnygWxh9f5XuwrdRQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?C=C3=A1ssio=20Gabriel?= , Takashi Iwai Subject: [PATCH 5.15 182/776] ALSA: usb-audio: Avoid false E-MU sample-rate notifications Date: Sat, 30 May 2026 17:58:16 +0200 Message-ID: <20260530160245.203187536@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cássio Gabriel commit fca9c850042a7ab4828ce3a9caa8bc40ea09856a upstream. snd_emuusb_set_samplerate() unconditionally notifies the E-MU SampleRate Extension Unit control after issuing SET_CUR. If snd_usb_mixer_set_ctl_value() fails, the control value has not changed, yet snd_usb_mixer_notify_id() still invalidates the cache and emits a value-change event to userspace. Notify the control only after a successful write. Fixes: 7d2b451e65d2 ("ALSA: usb-audio - Added functionality for E-mu 0404USB/0202USB/TrackerPre") Cc: stable@vger.kernel.org Signed-off-by: Cássio Gabriel Link: https://patch.msgid.link/20260421-alsa-emuusb-samplerate-notify-v1-1-8b63bbc1d7f1@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/mixer_quirks.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -1561,15 +1561,17 @@ void snd_emuusb_set_samplerate(struct sn { struct usb_mixer_interface *mixer; struct usb_mixer_elem_info *cval; + int err; int unitid = 12; /* SampleRate ExtensionUnit ID */ list_for_each_entry(mixer, &chip->mixer_list, list) { if (mixer->id_elems[unitid]) { cval = mixer_elem_list_to_info(mixer->id_elems[unitid]); - snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, - cval->control << 8, - samplerate_id); - snd_usb_mixer_notify_id(mixer, unitid); + err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, + cval->control << 8, + samplerate_id); + if (!err) + snd_usb_mixer_notify_id(mixer, unitid); break; } }