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Subject: Re: [PATCH] OvmfPkg/XenBusDxe: Don't call DisconnectController in Stop()
To: Anthony PERARD <anthony.perard@citrix.com>, devel@edk2.groups.io
Cc: Jordan Justen <jordan.l.justen@intel.com>,
 Ard Biesheuvel <ard.biesheuvel@linaro.org>,
 Julien Grall <julien.grall@arm.com>
References: <20190701111403.7007-1-anthony.perard@citrix.com>
From: "Laszlo Ersek" <lersek@redhat.com>
Message-ID: <e5d0ba4e-4e52-e2a2-2ebd-db20bb0ab7af@redhat.com>
Date: Mon, 1 Jul 2019 16:56:00 +0200
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On 07/01/19 13:14, Anthony PERARD wrote:
> Calling DisconnectController() on children isn't part of the job of
> EFI_DRIVER_BINDING_PROTOCOL.Stop() as it only needs to deallocate
> resources allocated in Start(). The disconnection will happen when
> both DevicePath and XenBus protocols gets uninstalled.
> 
> Reported-by: Laszlo Ersek <lersek@redhat.com>
> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
> ---
> 
> Notes:
>     Please apply this patch after:
>     "OvmfPkg/XenBusDxe: Close XenIoProtocol openned by children"
> 
>  OvmfPkg/XenBusDxe/XenBusDxe.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.c b/OvmfPkg/XenBusDxe/XenBusDxe.c
> index 7c07a96650..634c7b71eb 100644
> --- a/OvmfPkg/XenBusDxe/XenBusDxe.c
> +++ b/OvmfPkg/XenBusDxe/XenBusDxe.c
> @@ -446,12 +446,6 @@ XenBusDxeDriverBindingStop (
>        continue;
>      }
>      ChildData = XENBUS_PRIVATE_DATA_FROM_THIS (XenBusIo);
> -    Status = gBS->DisconnectController (ChildData->Handle, NULL, NULL);
> -    if (EFI_ERROR (Status)) {
> -      DEBUG ((EFI_D_ERROR, "XenBusDxe: error disconnecting child: %r\n",
> -              Status));
> -      continue;
> -    }
>  
>      Status = gBS->CloseProtocol (Dev->ControllerHandle, &gXenIoProtocolGuid,
>                      Dev->This->DriverBindingHandle, ChildData->Handle);
> 

Commit 6a1f06fadb26.

Thanks
Laszlo