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[efi] Allow efidev_parent() to traverse multiple device generations 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/41/head
Michael Brown 2015-09-07 01:25:41 +01:00
parent fa18bc4205
commit 5cea7bdb2a
1 changed files with 8 additions and 10 deletions
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18
src/interface/efi/efi_driver.c
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@ -68,18 +68,16 @@ static struct efi_device * efidev_find ( EFI_HANDLE device ) {
* @ret efidev Parent EFI device, or NULL * @ret efidev Parent EFI device, or NULL
*/ */
struct efi_device * efidev_parent ( struct device *dev ) { struct efi_device * efidev_parent ( struct device *dev ) {
struct device *parent = dev->parent; struct device *parent;
struct efi_device *efidev;
/* Check that parent exists and is an EFI device */ /* Walk upwards until we find an EFI device */
if ( ! parent ) while ( ( parent = dev->parent ) ) {
return NULL; if ( parent->desc.bus_type == BUS_TYPE_EFI )
if ( parent->desc.bus_type != BUS_TYPE_EFI ) return container_of ( parent, struct efi_device, dev );
return NULL; dev = parent;
}
/* Get containing EFI device */ return NULL;
efidev = container_of ( parent, struct efi_device, dev );
return efidev;
} }
/** /**