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Date:   Tue, 23 Oct 2018 13:39:43 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Aaron Ma <aaron.ma@...onical.com>, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: xhci: fix uninitialized completion when USB3
 port got wrong status

On 22.10.2018 20:53, Aaron Ma wrote:
> 
> 
> On 10/22/18 9:12 PM, Mathias Nyman wrote:
>> On 21.10.2018 20:08, Aaron Ma wrote:
>>> Realtek USB3.0 Card Reader [0bda:0328] reports wrong port status on
>>> Cannon lake PCH USB3.1 xHCI [8086:a36d] after resume from S3,
>>> after clear port reset it works fine.
>>>
>>> Since this device is registered on USB3 roothub at boot,
>>> when port status reports not superspeed, xhci_get_port_status will call
>>> an uninitialized completion in bus_state[0].
>>> Kernel will hang because of NULL pointer.
>>>
>>> Restrict the USB2 resume status check in USB2 roothub to fix hang issue.
>>> No harm to initialize USB3 bus_state[0] in case it is called.
>>>
>>> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
>>> ---
>>>    drivers/usb/host/xhci-hub.c  | 2 +-
>>>    drivers/usb/host/xhci-mem.c  | 1 >>>    drivers/usb/host/xhci-ring.c | 2 +-
>>>    3 files changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
>>> index 7e2a531ba321..d30ca6ceffc9 100644
>>> --- a/drivers/usb/host/xhci-hub.c
>>> +++ b/drivers/usb/host/xhci-hub.c
>>> @@ -876,7 +876,7 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
>>>                status |= USB_PORT_STAT_SUSPEND;
>>>        }
>>>        if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
>>> -        !DEV_SUPERSPEED_ANY(raw_port_status)) {
>>> +        !DEV_SUPERSPEED_ANY(raw_port_status) && 1 == hcd_index(hcd)) {
>>>            if ((raw_port_status & PORT_RESET) ||
>>>                    !(raw_port_status & PORT_PE))
>>>                return 0xffffffff;
>>
>> The original !DEV_SUPERSPEED_ANY() check was not suitable here.
>> It checks the port-speed field of portsc register (bits 13:10), which
>> are only valid for USB3
>> ports if all link training is done and port reached its "enabled" state.
>> Otherwise it will return 0, and USB3 ports may be mistaken for USB2 ports.
> 
> PORT_ENABLE should be already set to one.
> The same device ID card reader doesn't have issue on Sunrise Point.
> Maybe it is related to Cannon lake PCH USB controller?
> 

Ok, thanks for the info

> 
> V2 sent out. Cc-ed stable.
> 
>> Any chance you to check if the refactored code works with the Realtek
>> device?
>> I just created a "get_port_status_refactor" branch for it:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git
>> get_port_status_refactor
> 
> The hang issue is not reproduced on this kernel branch.
> 

Great, thanks for testing it

-Mathias

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