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USB: Fallback to generic driver when specific driver fails 

If ->probe fails for a device specific driver, ask the driver core to
reprobe us, after having flagged the device for the generic driver to be
forced.

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20191016093933.693-6-hadess@hadess.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bastien Nocera 2019-10-16 11:39:32 +02:00 committed by Greg Kroah-Hartman
parent 88b7381a93
commit 77419aa403
3 changed files with 8 additions and 1 deletions
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5
drivers/usb/core/driver.c
View File

@ -270,7 +270,10 @@ static int usb_probe_device(struct device *dev)
return error;
error = udriver->probe(udev);
/* TODO: fallback to generic driver in case of error */
if (error == -ENODEV && udriver != &usb_generic_driver) {
udev->use_generic_driver = 1;
return -EPROBE_DEFER;
}
return error;
}

3
drivers/usb/core/generic.c
View File

@ -213,6 +213,9 @@ static int __check_usb_generic(struct device_driver *drv, void *data)
static bool usb_generic_driver_match(struct usb_device *udev)
{
if (udev->use_generic_driver)
return true;
/*
* If any other driver wants the device, leave the device to this other
* driver.

1
include/linux/usb.h
View File

@ -708,6 +708,7 @@ struct usb_device {
unsigned lpm_disable_count;
u16 hub_delay;
unsigned use_generic_driver:1;
};
#define to_usb_device(d) container_of(d, struct usb_device, dev)