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 4803337473A; Tue, 21 Jul 2026 21:56:27 +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=1784670988; cv=none; b=ToHsTTUe3UFeCd18FhozlL/aYB9vM35iyMD2wmsgdjqIJNjn0XiGTmsssc3XIh3jFFrXJyXTpe8fKDC7RXBYkoWWgKyzMivIXHrd7sfgCJorqYDHWwd/7C5HGpow9TjJX4DLtzJXmjDNli8kUP4wpc7G/rO8rg56XUhSgc7Xtxo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784670988; c=relaxed/simple; bh=c8Drb7EYldXF0/c4X8w/bo8rjypBc4RZqLgb9/ClRdw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KdR4Y3xpGOu2iNjiIHeTnYbZtcV0pBTKHyQ2hLWKU8UyqW7qNx4Oc1cWbnf+Enh8CRWxkLqfjDA9mRpsAoDNbrm3xRWCAoELdRicZdpelmymR5c4ZtBraQmGr96SKs98nRqmPG5UAxIycDNwCzxEDzl8LaL8PSuA3ITqb2dzBYw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sdqcqTBk; 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="sdqcqTBk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ADEBA1F000E9; Tue, 21 Jul 2026 21:56:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784670987; bh=2Syb4H1VqaTVoCORewkeH1Z+1xsUUUZjADjUvM3+nmI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=sdqcqTBkfg8e3XwR7PUgsgw3as3Cl6PDErQeKj5MXExABwsGetWtgdKVsFrUsfS2D fxQ6FE41vqjVK7RDtwSXPeiH2WT5vMYRSMWOItAa4m+ExfUHfrEGboSpCWOXI+ZF9K rERkaLYhudfsPxksIlJc0AiO51WkPUqjPoUq/mBI= 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 5.15 074/843] ALSA: usb-audio: Update Babyface Pro control caches only after successful writes Date: Tue, 21 Jul 2026 17:15:09 +0200 Message-ID: <20260721152407.658002980@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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 d8f802ccf1fdbeb89d62748d6a0d0fbd442c8127 upstream. snd_bbfpro_ctl_put() and snd_bbfpro_vol_put() cache the requested packed control state in kcontrol->private_value before issuing the USB write. Their get and resume paths use that cached value directly, so a failed write can leave the driver reporting and later replaying a setting the hardware never accepted. Update the cached state only after a successful USB write. Fixes: 3e8f3bd04716 ("ALSA: usb-audio: RME Babyface Pro mixer patch") Cc: stable@vger.kernel.org Signed-off-by: Cássio Gabriel Link: https://patch.msgid.link/20260429-alsa-usb-quirks-cache-rollback-v1-2-01b35c688b80@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/mixer_quirks.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -2932,12 +2932,14 @@ static int snd_bbfpro_ctl_put(struct snd if (val == old_value) return 0; + err = snd_bbfpro_ctl_update(mixer, reg, idx, val); + if (err < 0) + return err; + kcontrol->private_value = reg | ((idx & SND_BBFPRO_CTL_IDX_MASK) << SND_BBFPRO_CTL_IDX_SHIFT) | ((val & SND_BBFPRO_CTL_VAL_MASK) << SND_BBFPRO_CTL_VAL_SHIFT); - - err = snd_bbfpro_ctl_update(mixer, reg, idx, val); - return err < 0 ? err : 1; + return 1; } static int snd_bbfpro_ctl_resume(struct usb_mixer_elem_list *list) @@ -3022,11 +3024,13 @@ static int snd_bbfpro_vol_put(struct snd new_val = uvalue & SND_BBFPRO_MIXER_VAL_MASK; + err = snd_bbfpro_vol_update(mixer, idx, new_val); + if (err < 0) + return err; + kcontrol->private_value = idx | (new_val << SND_BBFPRO_MIXER_VAL_SHIFT); - - err = snd_bbfpro_vol_update(mixer, idx, new_val); - return err < 0 ? err : 1; + return 1; } static int snd_bbfpro_vol_resume(struct usb_mixer_elem_list *list)