efi_open_protocol_information provides the agent and controller handles as well as the attributes and open count of an protocol on a handle.

Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- This patch was originally in a patch series but Alex has already accepted the preceding patches.

v4 Correct counting of valid entries in case 0 == item->info.open_count. v3 no change v2 no change --- lib/efi_loader/efi_boottime.c | 43 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index a527e33141..efbf7e35f5 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -1722,9 +1722,50 @@ static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle, struct efi_open_protocol_info_entry **entry_buffer, efi_uintn_t *entry_count) { + unsigned long buffer_size; + unsigned long count; + struct efi_handler *handler; + struct efi_open_protocol_info_item *item; + efi_status_t r; + EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer, entry_count); - return EFI_EXIT(EFI_NOT_FOUND); + + /* Check parameters */ + if (!entry_buffer) { + r = EFI_INVALID_PARAMETER; + goto out; + } + r = efi_search_protocol(handle, protocol, &handler); + if (r != EFI_SUCCESS) + goto out; + + /* Count entries */ + count = 0; + list_for_each_entry(item, &handler->open_infos, link) { + if (item->info.open_count) + ++count; + } + *entry_count = count; + *entry_buffer = NULL; + if (!count) { + r = EFI_SUCCESS; + goto out; + } + + /* Copy entries */ + buffer_size = count * sizeof(struct efi_open_protocol_info_entry); + r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size, + (void **)entry_buffer); + if (r != EFI_SUCCESS) + goto out; + count = 0; + list_for_each_entry(item, &handler->open_infos, link) { + if (item->info.open_count) + (*entry_buffer)[count++] = item->info; + } +out: + return EFI_EXIT(r); }

/*