usb: gadget: pxa25x_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/20231120215830.71071-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/pxa25x_udc.c b/drivers/usb/gadget/udc/pxa25x_udc.c
index df0551ecc810c61c8d50672d5732f035a05ca23f..1ac26cb49ecf987b6153cf819fe7d321da507cb8 100644 (file)
--- a/drivers/usb/gadget/udc/pxa25x_udc.c
+++ b/drivers/usb/gadget/udc/pxa25x_udc.c
@@ -2397,12 +2397,15 @@ static void pxa25x_udc_shutdown(struct platform_device *_dev)
        pullup_off();
 }
 
-static int pxa25x_udc_remove(struct platform_device *pdev)
+static void pxa25x_udc_remove(struct platform_device *pdev)
 {
        struct pxa25x_udc *dev = platform_get_drvdata(pdev);
 
-       if (dev->driver)
-               return -EBUSY;
+       if (dev->driver) {
+               dev_err(&pdev->dev,
+                       "Driver still in use but removing anyhow\n");
+               return;
+       }
 
        usb_del_gadget_udc(&dev->gadget);
        dev->pullup = 0;
@@ -2414,7 +2417,6 @@ static int pxa25x_udc_remove(struct platform_device *pdev)
                dev->transceiver = NULL;
 
        the_controller = NULL;
-       return 0;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -2472,7 +2474,7 @@ static int pxa25x_udc_resume(struct platform_device *dev)
 static struct platform_driver udc_driver = {
        .shutdown       = pxa25x_udc_shutdown,
        .probe          = pxa25x_udc_probe,
-       .remove         = pxa25x_udc_remove,
+       .remove_new     = pxa25x_udc_remove,
        .suspend        = pxa25x_udc_suspend,
        .resume         = pxa25x_udc_resume,
        .driver         = {