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

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
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
*/
struct efi_device * efidev_parent ( struct device *dev ) {
struct device *parent = dev->parent;
struct efi_device *efidev;
struct device *parent;
/* Check that parent exists and is an EFI device */
if ( ! parent )
return NULL;
if ( parent->desc.bus_type != BUS_TYPE_EFI )
return NULL;
/* Walk upwards until we find an EFI device */
while ( ( parent = dev->parent ) ) {
if ( parent->desc.bus_type == BUS_TYPE_EFI )
return container_of ( parent, struct efi_device, dev );
dev = parent;
}
/* Get containing EFI device */
efidev = container_of ( parent, struct efi_device, dev );
return efidev;
return NULL;
}
/**