Neo,
I don't think your change is needed because of the following existing logic
where RemoveAllPciDeviceOnBridge() is called to destroy/free all PCI nodes.
if (Operation == EfiPciHotplugRequestRemove) {
if (*NumberOfChildren == 0) {
//
// Remove all devices on the bridge
//
RemoveAllPciDeviceOnBridge (RootBridgeHandle, Bridge);
return EFI_SUCCESS;
}
Thanks,
Ray
________________________________
From: Hsueh, Hong-Chih (Neo) <hong-chih.hs...@amd.com>
Sent: Wednesday, May 1, 2024 2:24
To: Laszlo Ersek <ler...@redhat.com>; devel@edk2.groups.io
<devel@edk2.groups.io>; Ni, Ray <ray...@intel.com>
Cc: Ding, Feng (Sunnyvale) <feng1.d...@amd.com>; He, Jiangang
<jiangang...@amd.com>; Chang, Abner <abner.ch...@amd.com>;
gaolim...@byosoft.com.cn <gaolim...@byosoft.com.cn>
Subject: Re: [PATCH v2] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon
bridge hot-unplug
[AMD Official Use Only - General]
Hi @ray...@intel.com<mailto:ray...@intel.com>,
Sorry you bother you, may I have your feedback for this patch?
If it looks good to you could you help to give me an R-b ?
Thank you.
Regards,
Neo
________________________________
From: Laszlo Ersek <ler...@redhat.com>
Sent: Sunday, February 25, 2024 7:59 AM
To: Hsueh, Hong-Chih (Neo) <hong-chih.hs...@amd.com>; devel@edk2.groups.io
<devel@edk2.groups.io>
Cc: Ding, Feng (Sunnyvale) <feng1.d...@amd.com>; He, Jiangang
<jiangang...@amd.com>; Chang, Abner <abner.ch...@amd.com>; ray...@intel.com
<ray...@intel.com>; gaolim...@byosoft.com.cn <gaolim...@byosoft.com.cn>
Subject: Re: [PATCH v2] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon
bridge hot-unplug
Caution: This message originated from an External Source. Use proper caution
when opening attachments, clicking links, or responding.
On 2/22/24 17:28, Neo Hsueh wrote:
> A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions
> require PciHotPlugRequestNotify to add a root bridge or remove a root bridge
> completely.
> In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with
> no-action on second plug because bridge tree shows configured.
> Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event
> to fix this issue.
>
> Cc: Feng Ding <feng1.d...@amd.com>
> Cc: Jiangang He <jiangang...@amd.com>
> Signed-off-by: Neo Hsueh <hong-chih.hs...@amd.com>
> ---
> MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> index 3f8c6e6da7..2b7af60e0a 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> @@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
> }
> }
>
> + DestroyPciDeviceTree (Bridge);
> +
> //
> // End for
> //
This looks convincing to me, but I don't now nearly enough about
PciBusDxe internals (resource management in particular) to confidently
approve this patch. I can give an
Acked-by: Laszlo Ersek <ler...@redhat.com>
but the patch should not be merged until Ray provides an R-b.
Laszlo
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