linux-kernel - Re: [RFT PATCH v2] xhci: Fix memory leak when caching protocol extended capability PSI tables

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Message-ID: <bbe3378e-04e6-5223-a698-f744d05c9726@nvidia.com>
Date:   Fri, 14 Feb 2020 08:35:01 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>,
        <gregkh@...uxfoundation.org>, <m.szyprowski@...sung.com>
CC:     <pmenzel@...gen.mpg.de>, <mika.westerberg@...ux.intel.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-samsung-soc@...r.kernel.org>, <krzk@...nel.org>,
        stable <stable@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [RFT PATCH v2] xhci: Fix memory leak when caching protocol
 extended capability PSI tables


On 14/02/2020 07:47, Mathias Nyman wrote:
> On 13.2.2020 15.33, Jon Hunter wrote:
>>
>> On 11/02/2020 15:01, Mathias Nyman wrote:
>>> xhci driver assumed that xHC controllers have at most one custom
>>> supported speed table (PSI) for all usb 3.x ports.
>>> Memory was allocated for one PSI table under the xhci hub structure.
>>>
>>> Turns out this is not the case, some controllers have a separate
>>> "supported protocol capability" entry with a PSI table for each port.
>>> This means each usb3 roothub port can in theory support different custom
>>> speeds.
>>>
>>> To solve this, cache all supported protocol capabilities with their PSI
>>> tables in an array, and add pointers to the xhci port structure so that
>>> every port points to its capability entry in the array.
>>>
>>> When creating the SuperSpeedPlus USB Device Capability BOS descriptor
>>> for the xhci USB 3.1 roothub we for now will use only data from the
>>> first USB 3.1 capable protocol capability entry in the array.
>>> This could be improved later, this patch focuses resolving
>>> the memory leak.
>>>
>>> Reported-by: Paul Menzel <pmenzel@...gen.mpg.de>
>>> Reported-by: Sajja Venkateswara Rao <VenkateswaraRao.Sajja@....com>
>>> Fixes: 47189098f8be ("xhci: parse xhci protocol speed ID list for usb 3.1 usage")
>>> Cc: stable <stable@...r.kernel.org> # v4.4+
>>> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>>
>>
>> Since next-20200211, we have been observing a regression exiting suspend
>> on our Tegra124 Jetson TK1 board. Bisect is pointing to this commit and
>> reverting on top of -next fixes the problem.
>>
>> On exiting suspend, I am seeing the following ...
>>
>> [   56.216793] tegra-xusb 70090000.usb: Firmware already loaded, Falcon state 0x20
>> [   56.216834] usb usb3: root hub lost power or was reset
>> [   56.216837] usb usb4: root hub lost power or was reset
>> [   56.217760] tegra-xusb 70090000.usb: No ports on the roothubs?
>> [   56.218257] tegra-xusb 70090000.usb: failed to resume XHCI: -12
>> [   56.218299] PM: dpm_run_callback(): platform_pm_resume+0x0/0x40 returns -12
>> [   56.218312] PM: Device 70090000.usb failed to resume: error -12
>> [   56.334366] hub 4-0:1.0: hub_ext_port_status failed (err = -32)
>> [   56.334368] hub 3-0:1.0: hub_ext_port_status failed (err = -32)
>>
>> Let me know if you have any thoughts on this.
>>
>> Cheers
>> Jon
> 
> This was an issue with the first version, and should be fixed in the second.
> 
> next-20200211 has the faulty version, 
> next-20200213 is fixed, reverted first version and applied second.
> 
> Does next-20200213 work for you?

Yes it does. Sorry I am an idiot and should have read the changes and
thread more closely!

Thanks for fixing so quickly.

Jon

-- 
nvpublic