usb: gadget: fsl_udc: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

In the error path emit an error message replacing the (less useful)
message by the core. Apart from the improved error message there is no
change in behaviour.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231120215830.71071-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c
index 2693a10eb0c7cbc9503b4961c7471d16e6f8f17c..535b6e79a198e9a8ccb7aee83f87086c54c363a7 100644 (file)
--- a/drivers/usb/gadget/udc/fsl_udc_core.c
+++ b/drivers/usb/gadget/udc/fsl_udc_core.c
@@ -2532,15 +2532,18 @@ err_kfree:
 /* Driver removal function
  * Free resources and finish pending transactions
  */
-static int fsl_udc_remove(struct platform_device *pdev)
+static void fsl_udc_remove(struct platform_device *pdev)
 {
        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
 
        DECLARE_COMPLETION_ONSTACK(done);
 
-       if (!udc_controller)
-               return -ENODEV;
+       if (!udc_controller) {
+               dev_err(&pdev->dev,
+                       "Driver still in use but removing anyhow\n");
+               return;
+       }
 
        udc_controller->done = &done;
        usb_del_gadget_udc(&udc_controller->gadget);
@@ -2568,8 +2571,6 @@ static int fsl_udc_remove(struct platform_device *pdev)
         */
        if (pdata->exit)
                pdata->exit(pdev);
-
-       return 0;
 }
 
 /*-----------------------------------------------------------------
@@ -2667,7 +2668,7 @@ static const struct platform_device_id fsl_udc_devtype[] = {
 MODULE_DEVICE_TABLE(platform, fsl_udc_devtype);
 static struct platform_driver udc_driver = {
        .probe          = fsl_udc_probe,
-       .remove         = fsl_udc_remove,
+       .remove_new     = fsl_udc_remove,
        .id_table       = fsl_udc_devtype,
        /* these suspend and resume are not usb suspend and resume */
        .suspend        = fsl_udc_suspend,