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

[苏丽坤 <sulikun@loongson.cn>]

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Hi, Hao,Liming,




   this is my reply， function XhcInitializeDeviceSlot64 will init EndpointTransferRing,while fuctionUsbMassReadBlocks return (Invalid Parameter), which result in run function UsbMassReset, this will call  XhcDisableSlotCmd64, will clear EndpointTransferRing, like this Xhc->UsbDevContext[SlotId].EndpointTransferRing[Index] = NULL;  If  fuctionUsbMassReadBlocks return success also run function UsbMassReset, will hang for the same reason. why fuctionUsbMassReadBlocks return (Invalid Parameter), this function will call UsbBootRequestSense,this retun (Invalid Parameter). At the same time, Ehci alsoretun  (Invalid Parameter).




Thanks 
-----原始邮件-----
发件人:"Wu, Hao A" <hao.a.wu@intel.com>
发送时间:2023-07-25 10:18:42 (星期二)
收件人: "Gao, Liming" <gaoliming@byosoft.com.cn>, "devel@edk2.groups.io" <devel@edk2.groups.io>, "sulikun@loongson.cn" <sulikun@loongson.cn>, "Demeter, Miki" <miki.demeter@intel.com>
主题: RE: [edk2-devel] empty USB DVD disk hang Xhci



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

 

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>

 

Hao:

 Have you time to review this fix?

 

Thanks

Liming

发件人:devel@edk2.groups.io <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; miki.demeter@intel.com; 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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本邮件及其附件含有龙芯中科的商业秘密信息，仅限于发送给上面地址中列出的个人或群组。禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制或散发）本邮件及其附件中的信息。如果您错收本邮件，请您立即电话或邮件通知发件人并删除本邮件。 
This email and its attachments contain confidential information from Loongson Technology , which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this email in error, please notify the sender by phone or email immediately and delete it. 



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