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From:   Alexey Khoroshilov <khoroshilov@ispras.ru>
To:     Marek Szyprowski <m.szyprowski@samsung.com>,
        Felipe Balbi <balbi@kernel.org>
Cc:     Alexey Khoroshilov <khoroshilov@ispras.ru>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        ldv-project@linuxtesting.org
Subject: [PATCH] usb: dwc3: exynos: Fix error handling of clk_prepare_enable
Date:   Sat, 19 Jan 2019 00:17:37 +0300
Message-Id: <1547846257-19970-1-git-send-email-khoroshilov@ispras.ru>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

If clk_prepare_enable() fails in dwc3_exynos_probe(),
exynos->clks[0] is left undisabled because of usage
preincrement in while condition.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Fixes: 9f2168367a0a ("usb: dwc3: exynos: Rework clock handling and prepare for new variants")
---
 drivers/usb/dwc3/dwc3-exynos.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index cb7fcd7c0ad8..e7f6cff27b9a 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -78,7 +78,7 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 	for (i = 0; i < exynos->num_clks; i++) {
 		ret = clk_prepare_enable(exynos->clks[i]);
 		if (ret) {
-			while (--i > 0)
+			while (i-- > 0)
 				clk_disable_unprepare(exynos->clks[i]);
 			return ret;
 		}
-- 
2.7.4