Re: [PATCH v2 3/3] usb: chipidea: ci_hdrc_imx: implement usb_phy_init() error handling

["Peter Chen (CIX)" <peter.chen@kernel.org>]

On 25-03-16 13:26:56, Fedor Pchelkin wrote:
> usb_phy_init() may return an error code if e.g. its implementation fails
> to prepare/enable some clocks. And properly rollback on probe error path
> by calling the counterpart usb_phy_shutdown().
> 
> Found by Linux Verification Center (linuxtesting.org).
> 
> Fixes: be9cae2479f4 ("usb: chipidea: imx: Fix ULPI on imx53")
> Cc: stable@vger.kernel.org
> Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>

Acked-by: Peter Chen <peter.chen@kernel.org>

> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index d942b3c72640..4f8bfd242b59 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -484,7 +484,11 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  	    of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI) {
>  		pdata.flags |= CI_HDRC_OVERRIDE_PHY_CONTROL;
>  		data->override_phy_control = true;
> -		usb_phy_init(pdata.usb_phy);
> +		ret = usb_phy_init(pdata.usb_phy);
> +		if (ret) {
> +			dev_err(dev, "Failed to init phy\n");
> +			goto err_clk;
> +		}
>  	}
>  
>  	if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
> @@ -493,7 +497,7 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  	ret = imx_usbmisc_init(data->usbmisc_data);
>  	if (ret) {
>  		dev_err(dev, "usbmisc init failed, ret=%d\n", ret);
> -		goto err_clk;
> +		goto phy_shutdown;
>  	}
>  
>  	data->ci_pdev = ci_hdrc_add_device(dev,
> @@ -502,7 +506,7 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  	if (IS_ERR(data->ci_pdev)) {
>  		ret = PTR_ERR(data->ci_pdev);
>  		dev_err_probe(dev, ret, "ci_hdrc_add_device failed\n");
> -		goto err_clk;
> +		goto phy_shutdown;
>  	}
>  
>  	if (data->usbmisc_data) {
> @@ -536,6 +540,9 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
>  
>  disable_device:
>  	ci_hdrc_remove_device(data->ci_pdev);
> +phy_shutdown:
> +	if (data->override_phy_control)
> +		usb_phy_shutdown(data->phy);
>  err_clk:
>  	clk_disable_unprepare(data->clk_wakeup);
>  err_wakeup_clk:
> -- 
> 2.48.1
> 

-- 

Best regards,
Peter