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Date:   Wed, 8 May 2019 09:01:27 +0200
From:   Andrzej Pietrasiewicz <>
To:     John Stultz <>,
        Felipe Balbi <>
Cc:     "Yang, Fei" <>,
        Bjorn Andersson <>,
        Chen Yu <>,
        lkml <>,
        Linux USB List <>,
        Amit Pundir <>,
        Marek Szyprowski <>
Subject: Re: [REGRESSION] usb: gadget: f_fs: Allow scatter-gather buffers

Hi John,

+= Marek

W dniu 08.05.2019 o 04:18, John Stultz pisze:
> Since commit 772a7a724f69 ("usb: gadget: f_fs: Allow scatter-gather
> buffers"), I've been seeing trouble with adb transfers in Android on
> HiKey960, HiKey and now Dragonboard 845c.
> Sometimes things crash, but often the transfers just stop w/o any
> obvious error messages.
> Initially I thought it was an issue with the HiKey960 dwc3 usb patches
> being upstreamed, and was using the following hack workaround:
> Then dwc2 added sg support, and I ended up having to revert it to get
> by on HiKey:
> (See thread here:
> And now I've reproduced the same issue (with the same dwc3 workaround)
> on the already upstream code for Dragonboard 845c.
> Fei Yang has also reached out and mentioned he was seeing similar
> problems with the f_fs sg support.
> Andrzej: Do you have any ideas or suggestions on this? I'm happy to
> test or run any debug patches, if it would help narrow the issue down.

There is a patch:

which fixes a subtle bug, but hasn't been applied yet.

Can you please try it?

> If not, should we consider reverting the f_fs sg support?


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