Re: [edk2-devel] empty USB DVD disk hang Xhci

["Wu, Hao A" <hao.a.wu@intel.com>]

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Sorry, I do not have much resource to review this in detail. But the patch generally looks good to me:
Acked-by: Hao A Wu hao.a.wu@intel.com<mailto:hao.a.wu@intel.com>

However, I hope the below question can be answered (or add related information to the commit log message) before mering:
Likun, could you help to elaborate a bit more on why the below statement will return NULL pointer for “USB DVD with empty disk”?
EPRing        = (TRANSFER_RING *)(UINTN)Xhc->UsbDevContext[SlotId].EndpointTransferRing[Dci-1];


Best Regards,
Hao Wu

From: gaoliming <gaoliming@byosoft.com.cn>
Sent: Tuesday, July 25, 2023 9:44 AM
To: devel@edk2.groups.io; sulikun@loongson.cn; Demeter, Miki <miki.demeter@intel.com>
Cc: Wu, Hao A <hao.a.wu@intel.com>
Subject: 回复: [edk2-devel] empty USB DVD disk hang Xhci

Likun:
 This change is good to me.  Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn<mailto:gaoliming@byosoft.com.cn>>

Hao:
 Have you time to review this fix?

Thanks
Liming
发件人: devel@edk2.groups.io<mailto:devel@edk2.groups.io> <devel@edk2.groups.io<mailto:devel@edk2.groups.io>> 代表 苏丽坤
发送时间: 2023年7月18日 9:49
收件人: gaoliming@byosoft.com.cn<mailto:gaoliming@byosoft.com.cn>; miki.demeter@intel.com<mailto:miki.demeter@intel.com>; devel@edk2.groups.io<mailto:devel@edk2.groups.io>
主题: [edk2-devel] empty USB DVD disk hang Xhci


Hi

    We find a bug in xhci, USB DVD boot with emtpy disk will hang Xhci while Ehci can pass.

    The hang log is shown as : MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c(1847): TrsRing != ((void *) 0)

    We suggest a way to solve this bug is shown as: https://github.com/suling-123/edk2 the latest commit,   MdeModulePkg: Solve boot hang xhci driver when use USB DVD with empty disk, 950bc8781d81b96b0c7944e7ac947382b1bc0c06

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