linux-kernel - [PATCH v2 09/10] ASoC: tegra: Fix kcontrol put callback in ADX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 3 Nov 2021 19:22:25 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <broonie@...nel.org>, <lgirdwood@...il.com>, <perex@...ex.cz>,
        <tiwai@...e.com>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <alsa-devel@...a-project.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Sameer Pujar <spujar@...dia.com>
Subject: [PATCH v2 09/10] ASoC: tegra: Fix kcontrol put callback in ADX

The kcontrol put callback is expected to return 1 when there is change
in HW or when the update is acknowledged by driver. This would ensure
that change notifications are sent to subscribed applications. Filter
out duplicate updates in ADX driver.

Fixes: a99ab6f395a9 ("ASoC: tegra: Add Tegra210 based ADX driver")
Signed-off-by: Sameer Pujar <spujar@...dia.com>
Suggested-by: Jaroslav Kysela <perex@...ex.cz>
Suggested-by: Mark Brown <broonie@...nel.org>
---
 sound/soc/tegra/tegra210_adx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/tegra/tegra210_adx.c b/sound/soc/tegra/tegra210_adx.c
index d7c7849..933c450 100644
--- a/sound/soc/tegra/tegra210_adx.c
+++ b/sound/soc/tegra/tegra210_adx.c
@@ -193,6 +193,9 @@ static int tegra210_adx_put_byte_map(struct snd_kcontrol *kcontrol,
 	struct soc_mixer_control *mc =
 		(struct soc_mixer_control *)kcontrol->private_value;;
 
+	if (value == bytes_map[mc->reg])
+		return 0;
+
 	if (value >= 0 && value <= 255) {
 		/* update byte map and enable slot */
 		bytes_map[mc->reg] = value;
-- 
2.7.4