From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936475Ab0CMB0K (ORCPT ); Fri, 12 Mar 2010 20:26:10 -0500 Received: from kroah.org ([198.145.64.141]:60742 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934906Ab0CMAUI (ORCPT ); Fri, 12 Mar 2010 19:20:08 -0500 X-Mailbox-Line: From gregkh@kvm.kroah.org Fri Mar 12 16:15:09 2010 Message-Id: <20100313001509.282258587@kvm.kroah.org> User-Agent: quilt/0.48-4.4 Date: Fri, 12 Mar 2010 16:12:25 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Henrique de Moraes Holschuh Subject: [patch 047/123] thinkpad-acpi: fix ALSA callback return status In-Reply-To: <20100313001618.GA9811@kroah.com> In-Reply-To: <20100313001618.GA9811@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.33-stable review patch. If anyone has any objections, please let me know. ----------------- From: Henrique de Moraes Holschuh commit 88cc83772a3c7756b9f2b4ba835545ad90a08409 upstream. Clemens Ladisch reports that thinkpad-acpi improperly implements the ALSA API, and always returns 0 for success for the "put" callbacks while the API requires it to return "1" when the control value has been changed in the hardware/firmware. Rework the volume subdriver to be able to properly implement the ALSA API. Based on a patch by Clemens Ladisch . This fix is also needed on 2.6.33. Reported-by: Clemens Ladisch Signed-off-by: Henrique de Moraes Holschuh Signed-off-by: Greg Kroah-Hartman --- drivers/platform/x86/thinkpad_acpi.c | 39 ++++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 10 deletions(-) --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -6522,7 +6522,8 @@ static int volume_set_status(const u8 st return volume_set_status_ec(status); } -static int volume_set_mute_ec(const bool mute) +/* returns < 0 on error, 0 on no change, 1 on change */ +static int __volume_set_mute_ec(const bool mute) { int rc; u8 s, n; @@ -6537,22 +6538,37 @@ static int volume_set_mute_ec(const bool n = (mute) ? s | TP_EC_AUDIO_MUTESW_MSK : s & ~TP_EC_AUDIO_MUTESW_MSK; - if (n != s) + if (n != s) { rc = volume_set_status_ec(n); + if (!rc) + rc = 1; + } unlock: mutex_unlock(&volume_mutex); return rc; } +static int volume_alsa_set_mute(const bool mute) +{ + dbg_printk(TPACPI_DBG_MIXER, "ALSA: trying to %smute\n", + (mute) ? "" : "un"); + return __volume_set_mute_ec(mute); +} + static int volume_set_mute(const bool mute) { + int rc; + dbg_printk(TPACPI_DBG_MIXER, "trying to %smute\n", (mute) ? "" : "un"); - return volume_set_mute_ec(mute); + + rc = __volume_set_mute_ec(mute); + return (rc < 0) ? rc : 0; } -static int volume_set_volume_ec(const u8 vol) +/* returns < 0 on error, 0 on no change, 1 on change */ +static int __volume_set_volume_ec(const u8 vol) { int rc; u8 s, n; @@ -6569,19 +6585,22 @@ static int volume_set_volume_ec(const u8 n = (s & ~TP_EC_AUDIO_LVL_MSK) | vol; - if (n != s) + if (n != s) { rc = volume_set_status_ec(n); + if (!rc) + rc = 1; + } unlock: mutex_unlock(&volume_mutex); return rc; } -static int volume_set_volume(const u8 vol) +static int volume_alsa_set_volume(const u8 vol) { dbg_printk(TPACPI_DBG_MIXER, - "trying to set volume level to %hu\n", vol); - return volume_set_volume_ec(vol); + "ALSA: trying to set volume level to %hu\n", vol); + return __volume_set_volume_ec(vol); } static void volume_alsa_notify_change(void) @@ -6628,7 +6647,7 @@ static int volume_alsa_vol_get(struct sn static int volume_alsa_vol_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { - return volume_set_volume(ucontrol->value.integer.value[0]); + return volume_alsa_set_volume(ucontrol->value.integer.value[0]); } #define volume_alsa_mute_info snd_ctl_boolean_mono_info @@ -6651,7 +6670,7 @@ static int volume_alsa_mute_get(struct s static int volume_alsa_mute_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { - return volume_set_mute(!ucontrol->value.integer.value[0]); + return volume_alsa_set_mute(!ucontrol->value.integer.value[0]); } static struct snd_kcontrol_new volume_alsa_control_vol __devinitdata = {