ASoC: wm_adsp: Don't generate kcontrols without READ flags

BugLink: https://bugs.launchpad.net/bugs/1853208
[ Upstream commit 3ae7359c0e39f42a96284d6798fc669acff38140 ]

User space always expects to be able to read ALSA controls, so ensure
no kcontrols are generated without an appropriate READ flag. In the case
of a read of such a control zeros will be returned.

Signed-off-by: Stuart Henderson <stuarth@opensource.cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20191002084240.21589-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index d632a0511d62ac7a35da520748b3fc35eccd316b..158ce68bc9bf353f86569b94fba29baf2928d975 100644 (file)
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -1169,8 +1169,7 @@ static unsigned int wmfw_convert_flags(unsigned int in, unsigned int len)
        }
 
        if (in) {
-               if (in & WMFW_CTL_FLAG_READABLE)
-                       out |= rd;
+               out |= rd;
                if (in & WMFW_CTL_FLAG_WRITEABLE)
                        out |= wr;
                if (in & WMFW_CTL_FLAG_VOLATILE)