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usb: core: acpi: Use the sysdev pointer instead of controller device

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The controller device (hcd) does not always have the ACPI
companion assigned to it at all. We can not rely on it when
finding the ACPI companion for the root hub. Instead we need
to use the sysdev pointer.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20220428111056.3558-2-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2022-04-28 14:10:55 +03:00 committed by Greg Kroah-Hartman
parent 9a922c042a
commit f7ffaa6f62
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/core/usb-acpi.c
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@ -205,8 +205,11 @@ usb_acpi_find_companion_for_device(struct usb_device *udev)
struct usb_hub *hub;
if (!udev->parent) {
/* root hub is only child (_ADR=0) under its parent, the HC */
adev = ACPI_COMPANION(udev->dev.parent);
/*
* root hub is only child (_ADR=0) under its parent, the HC.
* sysdev pointer is the HC as seen from firmware.
*/
adev = ACPI_COMPANION(udev->bus->sysdev);
return acpi_find_child_device(adev, 0, false);
}