Re: [PATCH v1 1/1] OvmfPkg/VirtioNetDxe: Check ChildHandle argument in GetControllerName

["Sunny Wang" <Sunny.Wang@arm.com>]

Looks good.
Reviewed-by: Sunny Wang <sunny.wang@arm.com>

-----Original Message-----
From: Dimitrije Pavlov <dimitrije.pavlov@arm.com>
Sent: 17 August 2022 15:35
To: devel@edk2.groups.io
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>; Jiewen Yao <jiewen.yao@intel.com>; Liming Gao <gaoliming@byosoft.com.cn>; Sunny Wang <Sunny.Wang@arm.com>; Jeff Booher-Kaeding <Jeff.Booher-Kaeding@arm.com>; Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>
Subject: [PATCH v1 1/1] OvmfPkg/VirtioNetDxe: Check ChildHandle argument in GetControllerName

Per the UEFI specification, a device driver implementation should return
EFI_UNSUPPORTED if the ChildHandle argument in
EFI_COMPONENT_NAME2_PROTOCOL.GetControllerName() is not NULL.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Sunny Wang <Sunny.Wang@arm.com>
Cc: Jeff Booher-Kaeding <Jeff.Booher-Kaeding@arm.com>
Cc: Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>

Signed-off-by: Dimitrije Pavlov <Dimitrije.Pavlov@arm.com>
---
 OvmfPkg/VirtioNetDxe/ComponentName.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/OvmfPkg/VirtioNetDxe/ComponentName.c b/OvmfPkg/VirtioNetDxe/ComponentName.c
index e340ca2f8fe4..718096630f6f 100644
--- a/OvmfPkg/VirtioNetDxe/ComponentName.c
+++ b/OvmfPkg/VirtioNetDxe/ComponentName.c
@@ -129,6 +129,13 @@ VirtioNetGetControllerName (
     return EFI_INVALID_PARAMETER;
   }

+  //
+  // This is a device driver, so ChildHandle must be NULL.
+  //
+  if (ChildHandle != NULL) {
+    return EFI_UNSUPPORTED;
+  }
+
   //
   // confirm that the device is managed by this driver, using the VirtIo
   // Protocol
--
2.37.2

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