linux-kernel - [PATCH] ASoC: rockchip-i2s: fix infinite loop in rockchip_snd

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Message-Id: <1412755131-27542-1-git-send-email-sonnyrao@chromium.org>
Date:	Wed,  8 Oct 2014 00:58:51 -0700
From:	Sonny Rao <sonnyrao@...omium.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org, dianders@...omium.org,
	Jianqun <jay.xu@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	linux-rockchip@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-arm-kernel@...ts.infradead.org,
	Sonny Rao <sonnyrao@...omium.org>
Subject: [PATCH] ASoC: rockchip-i2s: fix infinite loop in rockchip_snd_txctrl

We can get into an infinite loop if the I2S_CLR register fails to
clear due to a missing break statement, so add that.

Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
---
 sound/soc/rockchip/rockchip_i2s.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index 033487c..f373e37 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -108,8 +108,10 @@ static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 			while (val) {
 				regmap_read(i2s->regmap, I2S_CLR, &val);
 				retry--;
-				if (!retry)
+				if (!retry) {
 					dev_warn(i2s->dev, "fail to clear\n");
+					break;
+				}
 			}
 		}
 	}
-- 
1.8.3.2

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