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efi_loader: function to unlink udevice and handle

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When deleting a device or a handle we must remove the link between the two
to avoid dangling references.

Provide function efi_unlink_dev() for this purpose.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt 2022-10-03 09:47:51 +02:00
parent 874490c7ec
commit 16b27b67c5
2 changed files with 20 additions and 0 deletions
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1
include/efi_loader.h
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@ -708,6 +708,7 @@ const char *guid_to_sha_str(const efi_guid_t *guid);
int algo_to_len(const char *algo);
int efi_link_dev(efi_handle_t handle, struct udevice *dev);
int efi_unlink_dev(efi_handle_t handle);
/**
* efi_size_in_pages() - convert size in bytes to size in pages

19
lib/efi_loader/efi_helper.c
View file

@ -171,3 +171,22 @@ int efi_link_dev(efi_handle_t handle, struct udevice *dev)
handle->dev = dev;
return dev_tag_set_ptr(dev, DM_TAG_EFI, handle);
}
/**
* efi_unlink_dev() - unlink udevice and handle
*
* @handle: EFI handle to unlink
*
* Return: 0 on success, negative on failure
*/
int efi_unlink_dev(efi_handle_t handle)
{
int ret;
ret = dev_tag_del(handle->dev, DM_TAG_EFI);
if (ret)
return ret;
handle->dev = NULL;
return 0;
}