On Mon, Mar 23, 2020 at 09:55:43PM +0200, Andy Shevchenko wrote: > The ACPI companion of the device has to be set for USB interfaces > in order to read and attach the properties described in the ACPI table. > Use ACPI_COMPANION_SET macro to set this. > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> > --- > drivers/usb/core/message.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c > index 5adf489428aa..d5f834f16993 100644 > --- a/drivers/usb/core/message.c > +++ b/drivers/usb/core/message.c > @@ -5,6 +5,7 @@ > * Released under the GPLv2 only. > */ > > +#include <linux/acpi.h> > #include <linux/pci.h> /* for scatterlist macros */ > #include <linux/usb.h> > #include <linux/module.h> > @@ -1941,6 +1942,7 @@ int usb_set_configuration(struct usb_device *dev, int configuration) > intf->dev.of_node = usb_of_get_interface_node(dev, > configuration, ifnum); > } > + ACPI_COMPANION_SET(&intf->dev, ACPI_COMPANION(&dev->dev)); > intf->dev.driver = NULL; > intf->dev.bus = &usb_bus_type; > intf->dev.type = &usb_if_device_type; And what does this "fix"? Is this a new feature, what isn't working today without this change? And if it is a fix, should it be backported to older kernels, how far? greg k-h
