linux-kernel - [PATCH] ASoC: codecs: dmic: Fix check of return value from read of 'num-channels'

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Date:   Fri, 19 Jan 2018 15:36:50 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] ASoC: codecs: dmic: Fix check of return value from read of 'num-channels'

Commit 7fb59e940f62 ("ASoC: codecs: dmic: Make number of channels
 configurable") introduces an optional property to the device tree
to specify the number of DMIC channels. dmic_codec_probe() uses
of_property_read_u32() to read the DT value, and expects a return
value of -ENOENT when the property does not exist. This expectation
is incorrect, the actual value returned in this case is -EINVAL (see
of_find_property_value_of_size(), which is called under the hood).
Check for -EINVAL instead.

Fixes: 7fb59e940f62 ("ASoC: codecs: dmic: Make number of channels configurable")
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
 sound/soc/codecs/dmic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index c88f974ebe3e..cf83c423394d 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -113,7 +113,7 @@ static int dmic_dev_probe(struct platform_device *pdev)

 	if (pdev->dev.of_node) {
 		err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);
-		if (err && (err != -ENOENT))
+		if (err && (err != -EINVAL))
 			return err;

 		if (!err) {
-- 
2.16.0.rc1.238.g530d649a79-goog