linux-kernel - Re: BUG: scheduling while atomic in f

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Message-ID: <CALAqxLW0scq+WxcEZEojdap_UdN7r0aEV6+KxsZ4H2WFXHVXcQ@mail.gmail.com>
Date:   Mon, 3 Oct 2016 12:19:42 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Michal Nazarewicz <mina86@...a86.com>
Cc:     Chen Yu <chenyu56@...wei.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Biggo Wang <wangbinghui@...ilicon.com>,
        lkml <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
        Amit Pundir <amit.pundir@...aro.org>,
        Guodong Xu <guodong.xu@...aro.org>
Subject: Re: BUG: scheduling while atomic in f_fs when gadget remove driver

On Wed, Sep 28, 2016 at 2:38 PM, Michal Nazarewicz <mina86@...a86.com> wrote:
> On Wed, Sep 28 2016, Michal Nazarewicz wrote:
>> With that done, the only thing which needs a mutex is
>> epfile->read_buffer.
>
> Perhaps this would do:
>
> ---- >8 -------------------------------------------------- -------------
> From 6416a1065203a39328311f6c58083089efe169aa Mon Sep 17 00:00:00 2001
> From: Michal Nazarewicz <mina86@...a86.com>
> Date: Wed, 28 Sep 2016 23:36:56 +0200
> Subject: [RFC] usb: gadget: f_fs: stop sleeping in ffs_func_eps_disable
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> ffs_func_eps_disable is called from atomic context so it cannot sleep
> thus cannot grab a mutex.  Change the handling of epfile->read_buffer
> to use non-sleeping synchronisation method.
>
> Reported-by: Chen Yu <chenyu56@...wei.com>
> Signed-off-by: Michał Nazarewicz <mina86@...a86.com>
> Fixes: 9353afbbfa7b ("buffer data from ‘oversized’ OUT requests")

So the patch here seems to be in some odd encoding? Can you resend it
using git-send-email or in some way other then embedding it inline
here? Maybe just point me to a git tree that has it?

thanks
-john