From: Matthias Kaehlcke mka@chromium.org
commit e5854355d76b8d768cea8e4fc3ce6dfdba25518a upstream.
The onboard_hub 'driver' consists of two drivers, a platform driver and a USB driver. Currently when the onboard hub driver is initialized it first registers the platform driver, then the USB driver. This results in a race condition when the 'attach' work is executed, which is scheduled when the platform device is probed. The purpose of fhe 'attach' work is to bind elegible USB hub devices to the onboard_hub USB driver. This fails if the work runs before the USB driver has been registered.
Register the USB driver first, then the platform driver. This increases the chances that the onboard_hub USB devices are probed before their corresponding platform device, which the USB driver tries to locate in _probe(). The driver already handles this situation and defers probing if the onboard hub platform device doesn't exist yet.
Cc: stable@vger.kernel.org Fixes: 8bc063641ceb ("usb: misc: Add onboard_usb_hub driver") Link: https://lore.kernel.org/lkml/Y6W00vQm3jfLflUJ@hovoldconsulting.com/T/#m0d642... Reported-by: Alexander Stein alexander.stein@ew.tq-group.com Signed-off-by: Matthias Kaehlcke mka@chromium.org Tested-by: Stefan Wahren stefan.wahren@i2se.com Link: https://lore.kernel.org/r/20230110172954.v2.1.I75494ebee7027a50235ce4b1e930f... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/misc/onboard_usb_hub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/usb/misc/onboard_usb_hub.c +++ b/drivers/usb/misc/onboard_usb_hub.c @@ -431,13 +431,13 @@ static int __init onboard_hub_init(void) { int ret;
- ret = platform_driver_register(&onboard_hub_driver); + ret = usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE); if (ret) return ret;
- ret = usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE); + ret = platform_driver_register(&onboard_hub_driver); if (ret) - platform_driver_unregister(&onboard_hub_driver); + usb_deregister_device_driver(&onboard_hub_usbdev_driver);
return ret; }