linux-kernel - [PATCH] ASoC: wm_adsp: Fix uninitialized variable warnings

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Date:   Mon, 11 Jan 2021 13:38:25 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <patches@...nsource.cirrus.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH] ASoC: wm_adsp: Fix uninitialized variable warnings

wm_adsp_read_data_word() used if (ret) to check for an error from
wm_adsp_read_raw_data_block(). While this is perfectly valid,
wm_adsp_read_raw_data_block() itself uses if (ret < 0) and three
calls to wm_adsp_read_data_word() also use if (ret < 0).

This creates an error check chain like this:

  1st) if (ret < 0) return ret;
  2nd) if (ret) return ret;
  3rd) if (ret < 0) ...

This can confuse the compiler into thinking that there are possible
returns > 0 from the middle if() that are not handled by the final
if(). If this was true it would lead to using uninitialized variables
later in the outer function.

Fix this by changing the test in wm_adsp_read_data_word() to be
if (ret < 0).

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 sound/soc/codecs/wm_adsp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index f8ad768364c2..1fc7bc1970ea 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -3694,7 +3694,7 @@ static inline int wm_adsp_read_data_word(struct wm_adsp *dsp, int mem_type,
 	int ret;

 	ret = wm_adsp_read_raw_data_block(dsp, mem_type, mem_addr, 1, &raw);
-	if (ret)
+	if (ret < 0)
 		return ret;

 	*data = be32_to_cpu(raw) & 0x00ffffffu;
-- 
2.20.1