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Date: Sat, 2 Jun 2018 15:19:47 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Biju Das <biju.das@bp.renesas.com>
Cc: Vinod Koul <vinod.koul@intel.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        Simon Horman <horms@verge.net.au>,
        Chris Paterson <chris.paterson2@renesas.com>,
        Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
        stable@vger.kernel.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>
Subject: Re: [PATCH ] dmaengine: usb-dmac: fix endless loop in
 usb_dmac_chan_terminate_all()
Message-ID: <20180602131947.GG31493@kroah.com>
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On Thu, May 31, 2018 at 09:48:24AM +0100, Biju Das wrote:
> From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> 
> commit d9f5efade2cfd729138a7cafb46d01044da40f5e upstream
> 
> This patch fixes an issue that list_for_each_entry() in
> usb_dmac_chan_terminate_all() is possible to cause endless loop because
> this will move own desc to the desc_freed. So, this driver should use
> list_for_each_entry_safe() instead of list_for_each_entry().
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
> [biju: cherry-pick to 4.4]
> Signed-off-by: Biju Das <biju.das@bp.renesas.com>
> ---
> Hello Greg,
> 
> I have observed a CPU lock condition with USB DMAC driver on koelsch platform. 
> This patch fixes the issue on 4.4 stable. It is reproducible with ethernet(RNDIS/ECM)
> gadget configuration.

Now applied, thanks.

greg k-h