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

[Fedor Pchelkin]

usb_phy_init() may return an error code if e.g. its implementation fails
to prepare/enable some clocks. Detect this early. Trying to disable it
later on driver removal would result in a WARNING splat.

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@xxxxxxxxxxxxxxx
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
---
 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 3f11ae071c7f..720b998376b9 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -470,7 +470,11 @@ 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)
@@ -479,7 +483,7 @@ 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,
@@ -488,7 +492,7 @@ 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) {
@@ -522,6 +526,9 @@ 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