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efi_driver: don't bind internal block devices

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UEFI block devices can either mirror U-Boot's internal devices or be
provided by an EFI application like iPXE.

When ConnectController() is invoked for the EFI_BLOCK_IO_PROTOCOL
interface for such an application provided device we create a virtual
U-Boot block device of type "efi_blk".

Currently we do not call ConnectController() when handles for U-Boot's
internal block devices are created. If an EFI application calls
ConnectController() for a handle relating to an internal block device,
we erroneously create an extra "efi_blk" block device.

E.g. the UEFI shell has a command 'connect -r' which calls
ConnectController() for all handles with device path protocol.

In the Supported() method of our EFI_DRIVER_BINDING_PROTOCOL return
EFI_UNSUPPORTED when dealing with an U-Boot internal device.

Reported-by: Etienne Carriere <etienne.carriere@linaro.org>
Fixes: commit 05ef48a248 ("efi_driver: EFI block driver")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Tested-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Heinrich Schuchardt 2022-09-09 06:57:58 +00:00
parent 7932548939
commit 8cf8ad3533
1 changed files with 9 additions and 0 deletions
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9
lib/efi_driver/efi_uclass.c
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@ -71,6 +71,15 @@ static efi_status_t EFIAPI efi_uc_supported(
EFI_ENTRY("%p, %p, %ls", this, controller_handle,
efi_dp_str(remaining_device_path));
/*
* U-Boot internal devices install protocols interfaces without calling
* ConnectController(). Hence we should not bind an extra driver.
*/
if (controller_handle->dev) {
ret = EFI_UNSUPPORTED;
goto out;
}
ret = EFI_CALL(systab.boottime->open_protocol(
controller_handle, bp->ops->protocol,
&interface, this->driver_binding_handle,