linux-kernel - [PATCH] ASoC: stm32: sai: fix less than zero comparison on unsigned int

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Message-Id: <20181031193143.6994-1-colin.king@canonical.com>
Date:   Wed, 31 Oct 2018 19:31:43 +0000
From:   Colin King <colin.king@...onical.com>
To:     Olivier Moysan <olivier.moysan@...com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: stm32: sai: fix less than zero comparison on unsigned int

From: Colin Ian King <colin.king@...onical.com>

Currently, the comparison of div < 0 is always false because div is
an unsigned int. Fix this by making div an int.

Detected by CoverityScan, CID#1475309 ("Unsigned compared against 0")

Fixes: 8307b2afd386 "(ASoC: stm32: sai: set sai as mclk clock provider")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/soc/stm/stm32_sai_sub.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 211589b0b2ef..d4825700b63f 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -336,8 +336,7 @@ static int stm32_sai_mclk_set_rate(struct clk_hw *hw, unsigned long rate,
 {
 	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
 	struct stm32_sai_sub_data *sai = mclk->sai_data;
-	unsigned int div;
-	int ret;
+	int div, ret;
 
 	div = stm32_sai_get_clk_div(sai, parent_rate, rate);
 	if (div < 0)
-- 
2.19.1