linux-kernel - Re: [PATCH v2] rcar-dmac: initialize all data before registering IRQ handler

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Date:   Fri, 25 Aug 2017 12:28:01 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Anton Volkov <avolkov@...ras.ru>,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        ldv-project@...uxtesting.org, dmaengine@...r.kernel.org,
        geert+renesas@...der.be
Subject: Re: [PATCH v2] rcar-dmac: initialize all data before registering IRQ
 handler

On Mon, Aug 21, 2017 at 06:31:57AM +0000, Kuninori Morimoto wrote:
> 
> From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> 
> Anton Volkov noticed that engine->dev is NULL before
> of_dma_controller_register() in probe.
> Thus there might be a NULL pointer dereference in
> rcar_dmac_chan_start_xfer while accessing chan->chan.device->dev which
> is equal to (&dmac->engine)->dev.
> On same reason, same and similar things will happen if we didn't
> initialize all necessary data before calling register irq function.
> To be more safety code, this patch initialize all necessary data
> before calling register irq function.

Applied after adding subsytem name, thanks

-- 
~Vinod