linux-kernel - Re: [PATCH v2] usb: musb: sunxi: Explicitly release USB PHY on exit

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Date:   Mon, 9 Oct 2017 22:22:52 -0500
From:   Bin Liu <b-liu@...com>
To:     Jonathan Liu <net147@...il.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2] usb: musb: sunxi: Explicitly release USB PHY on exit

On Tue, Oct 10, 2017 at 01:45:25PM +1100, Jonathan Liu wrote:
> This fixes a kernel oops when unloading the driver due to usb_put_phy
> being called after usb_phy_generic_unregister when the device is
> detached. Calling usb_phy_generic_unregister causes x->dev->driver to
> be NULL in usb_put_phy and results in a NULL pointer dereference.
> 
> Cc: stable@...r.kernel.org # v4.3+
> Signed-off-by: Jonathan Liu <net147@...il.com>
> ---
> Changes for v2:
>  - Use devm_usb_put_phy instead of usb_put_phy
> 
>  drivers/usb/musb/sunxi.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
> index c9a09b5bb6e5..dc353e24d53c 100644
> --- a/drivers/usb/musb/sunxi.c
> +++ b/drivers/usb/musb/sunxi.c
> @@ -297,6 +297,8 @@ static int sunxi_musb_exit(struct musb *musb)
>  	if (test_bit(SUNXI_MUSB_FL_HAS_SRAM, &glue->flags))
>  		sunxi_sram_release(musb->controller->parent);
>  
> +	devm_usb_put_phy(glue->dev, glue->xceiv);
> +
>  	return 0;
>  }


Applied. Thanks.
-Bin.