linux-kernel - RE: [RFC][PATCH 0/2] Avoiding DWC3 transfer stalls/hangs when using adb over f

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Message-ID: <02E7334B1630744CBDC55DA8586225837F9EE280@ORSMSX102.amr.corp.intel.com>
Date:   Thu, 23 Jan 2020 16:29:24 +0000
From:   "Yang, Fei" <fei.yang@...el.com>
To:     Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        John Stultz <john.stultz@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>
CC:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Thinh Nguyen <thinhn@...opsys.com>,
        Tejas Joglekar <tejas.joglekar@...opsys.com>,
        "Jack Pham" <jackp@...eaurora.org>, Todd Kjos <tkjos@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: RE: [RFC][PATCH 0/2] Avoiding DWC3 transfer stalls/hangs when using
 adb over f_fs

>> Hey all,
>>    I wanted to send these out for comment and thoughts.
>> 
>> Since ~4.20, when the functionfs gadget enabled scatter-gather 
>> support, we have seen problems with adb connections stalling and 
>> stopping to function on hardware with dwc3 usb controllers.
>> Specifically, HiKey960, Dragonboard 845c, and Pixel3 devices.
>
> Any chance this:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=f63333e8e4fd63d8d8ae83b89d2c38cf21d64801
This is a different issue. I have tried initializing num_sgs when debugging this adb stall problem, but it didn't help.

>> has something to do with the problem you are reporting?
>
>> Andrzej