[PATCH v3] usb: dwc2: Add missing cleanups when usb_add_gadget_udc() fails

[PATCH v3] usb: dwc2: Add missing cleanups when usb_add_gadget_udc() fails

[Martin Blumenstingl]

Call dwc2_debugfs_exit() and dwc2_hcd_remove() (if the HCD was enabled
earlier) when usb_add_gadget_udc() has failed. This ensures that the
debugfs entries created by dwc2_debugfs_init() as well as the HCD are
cleaned up in the error path.

Fixes: 207324a321a866 ("usb: dwc2: Postponed gadget registration to the udc class driver")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
Changes since v2 at [1]:
- add #if around the new label and it's code to prevent the following
  warning found by the Kernel test robot:
    unused label 'error_debugfs' [-Wunused-label]

Changes since v1 at [0]
- also cleanup the HCD as suggested by Minas (thank you!)
- updated the subject accordingly


[0] https://patchwork.kernel.org/patch/11631381/
[1] https://patchwork.kernel.org/patch/11642957/


 drivers/usb/dwc2/platform.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index cb8ddbd53718..b74099764b2d 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -583,12 +583,19 @@ static int dwc2_driver_probe(struct platform_device *dev)
 		retval = usb_add_gadget_udc(hsotg->dev, &hsotg->gadget);
 		if (retval) {
 			dwc2_hsotg_remove(hsotg);
-			goto error_init;
+			goto error_debugfs;
 		}
 	}
 #endif /* CONFIG_USB_DWC2_PERIPHERAL || CONFIG_USB_DWC2_DUAL_ROLE */
 	return 0;
 
+#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \
+	IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)
+error_debugfs:
+	dwc2_debugfs_exit(hsotg);
+	if (hsotg->hcd_enabled)
+		dwc2_hcd_remove(hsotg);
+#endif
 error_init:
 	if (hsotg->params.activate_stm_id_vb_detection)
 		regulator_disable(hsotg->usb33d);
-- 
2.27.0

Re: [PATCH v3] usb: dwc2: Add missing cleanups when usb_add_gadget_udc() fails

[Greg KH]

On Mon, Jul 27, 2020 at 07:38:01PM +0200, Martin Blumenstingl wrote:
> Call dwc2_debugfs_exit() and dwc2_hcd_remove() (if the HCD was enabled
> earlier) when usb_add_gadget_udc() has failed. This ensures that the
> debugfs entries created by dwc2_debugfs_init() as well as the HCD are
> cleaned up in the error path.
> 
> Fixes: 207324a321a866 ("usb: dwc2: Postponed gadget registration to the udc class driver")
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
> Changes since v2 at [1]:
> - add #if around the new label and it's code to prevent the following
>   warning found by the Kernel test robot:
>     unused label 'error_debugfs' [-Wunused-label]
> 
> Changes since v1 at [0]
> - also cleanup the HCD as suggested by Minas (thank you!)
> - updated the subject accordingly
> 
> 
> [0] https://patchwork.kernel.org/patch/11631381/
> [1] https://patchwork.kernel.org/patch/11642957/


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>