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efi_loader: correcty determine total device path length

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Device paths may consist of multiple instances. Up to now we have only
considered the size of the first instance. For the services of the
EFI_DEVICE_PATH_UTILITIES_PROTOCOL in most cases the total length of the
device path is relevant.

So let's rename efi_dp_size() to efi_dp_instance_size() and create a new
function efi_dp_size() that calculates the total device path length.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2018-04-16 07:59:08 +02:00 • committed by Alexander Graf
parent adb575124d
commit f6dd3f359c
3 changed files with 31 additions and 12 deletions
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4
lib/efi_loader/efi_boottime.c
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@ -2219,7 +2219,7 @@ static efi_status_t EFIAPI efi_locate_device_path(
}
/* Find end of device path */
len = efi_dp_size(*device_path);
len = efi_dp_instance_size(*device_path);
/* Get all handles implementing the protocol */
ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
@ -2234,7 +2234,7 @@ static efi_status_t EFIAPI efi_locate_device_path(
if (ret != EFI_SUCCESS)
continue;
dp = (struct efi_device_path *)handler->protocol_interface;
len_dp = efi_dp_size(dp);
len_dp = efi_dp_instance_size(dp);
/*
* This handle can only be a better fit
* if its device path length is longer than the best fit and