Re: [PATCH] usb: dwc2: fix panic for coherent memory allocation

From	Leo Yan <leo.yan@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] usb: dwc2: fix panic for coherent memory allocation
Date	2017-01-07 10:50 +0100
Message-ID	<sWVNn-6Te-17@gated-at.bofh.it> (permalink)
References	<sWt4K-3N8-31@gated-at.bofh.it> <sWKoV-7NO-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Jan 06, 2017 at 01:36:11PM -0800, John Stultz wrote:
> On Thu, Jan 5, 2017 at 6:50 PM, Leo Yan <leo.yan@linaro.org> wrote:
> > When use configfs to configure USB port as as ethernet gadget, the
> > kernel has panic with below backtrace; it clearly indicates the
> > coherent memory allocation is happened in the interrupt context,
> > but the function __get_vm_area_node() is possible to be scheduling
> > out so function __get_vm_area_node() triggers panic if it's called
> > from interrupt context.
> >
> > To fix this issue, simply to change gfp_flag from GFP_KERNEL to
> > GFP_NOWAIT so it can support to allocate coherent memory from
> > interrupt context.
> 
> This looks like it duplicates the similar patch I'm told should be
> queued for 4.10-rc3:
>     https://lkml.org/lkml/2016/12/1/120

Yeah, this patch is duplicate. Please ignore this one.

Thanks,
Leo Yan

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[PATCH] usb: dwc2: fix panic for coherent memory allocation Leo Yan <leo.yan@linaro.org> - 2017-01-06 04:10 +0100
  Re: [PATCH] usb: dwc2: fix panic for coherent memory allocation John Stultz <john.stultz@linaro.org> - 2017-01-06 22:40 +0100
    Re: [PATCH] usb: dwc2: fix panic for coherent memory allocation Leo Yan <leo.yan@linaro.org> - 2017-01-07 10:50 +0100

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