linux-kernel - [PATCH] [sound/i2c/cs8427] Fix int to char conversion

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Message-Id: <20181018103303.30226-1-philipp97kl@gmail.com>
Date:   Thu, 18 Oct 2018 12:33:02 +0200
From:   Philipp Klocke <philipp97kl@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     lukas.bulwahn@...il.com, linux-kernel@...r.kernel.org,
        Philipp Klocke <philipp97kl@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Subject: [PATCH] [sound/i2c/cs8427] Fix int to char conversion

Compiling with clang yields the following warning:

sound/i2c/cs8427.c:140:31: warning: implicit conversion from 'int'
to 'char' changes value from 160 to -96 [-Wconstant-conversion]
    data[0] = CS8427_REG_AUTOINC | CS8427_REG_CORU_DATABUF;
            ~ ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Because CS8427_REG_AUTOINC is defined as 128, it is too big for a
char field.
So change data from char to unsigned char, that it can hold the value.

This patch does not change the generated code.

Signed-off-by: Philipp Klocke <philipp97kl@...il.com>
---
 sound/i2c/cs8427.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/i2c/cs8427.c b/sound/i2c/cs8427.c
index 2647309bc675..8afa2f888466 100644
--- a/sound/i2c/cs8427.c
+++ b/sound/i2c/cs8427.c
@@ -118,7 +118,7 @@ static int snd_cs8427_send_corudata(struct snd_i2c_device *device,
 	struct cs8427 *chip = device->private_data;
 	char *hw_data = udata ?
 		chip->playback.hw_udata : chip->playback.hw_status;
-	char data[32];
+	unsigned char data[32];
 	int err, idx;
 
 	if (!memcmp(hw_data, ndata, count))
-- 
2.19.1