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SubjectRe: [PATCH] usb: dwc3: exynos: Fix error handling of clk_prepare_enable
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Hi Alexey,

On 2019-01-18 22:17, Alexey Khoroshilov wrote:
> 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")

My fault. There is also a similar issue dwc3_exynos_resume(), so please
fix it too if possible.

> ---
> 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;
> }

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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