linux-kernel - Re: [REGRESSION] usb: gadget: f_fs: Allow scatter-gather buffers

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Message-ID: <CALAqxLVqGLqcaE=VTm25-yj=nwhi+5Bd1F0uib6x9nez2KtSMQ@mail.gmail.com>
Date:   Tue, 21 May 2019 08:34:02 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Andrzej Pietrasiewicz <andrzej.p@...labora.com>
Cc:     "Yang, Fei" <fei.yang@...el.com>, Felipe Balbi <balbi@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Chen Yu <chenyu56@...wei.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "kernel@...labora.com" <kernel@...labora.com>
Subject: Re: [REGRESSION] usb: gadget: f_fs: Allow scatter-gather buffers

On Tue, May 21, 2019 at 3:04 AM Andrzej Pietrasiewicz
<andrzej.p@...labora.com> wrote:
>
> One thing that becomes evident now is that adb uses async io.
> It seems that interaction of async io and s-g mode should be further
> investigated.

Although on our devices, we have async io disabled w/ adb, as there is
an existing/separate issue w/ the dwc3 driver in 4.19 and older
kernels. So it seems its not strictly connected to async io.

thanks
-john