linux-kernel - Re: [PATCH for-5.8 2/2] usb: dwc3: meson-g12a: fix USB2 PHY initialization on G12A and A1 SoCs

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Date:   Wed, 27 May 2020 10:53:15 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     balbi@...nel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-usb@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        hanjie.lin@...ogic.com, yue.wang@...ogic.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "kernelci.org bot" <bot@...nelci.org>
Subject: Re: [PATCH for-5.8 2/2] usb: dwc3: meson-g12a: fix USB2 PHY
 initialization on G12A and A1 SoCs

On Wed, May 27, 2020 at 10:17:31AM +0200, Neil Armstrong wrote:
> Hi Martin,
> 
> On 26/05/2020 22:29, Martin Blumenstingl wrote:
> > dwc3_meson_g12a_usb2_init_phy() crashes with NULL pointer on an SM1
> > board (which uses the same USB setup as G12A) dereference as reported
> > by the Kernel CI bot. This is because of the following call flow:
> >   dwc3_meson_g12a_probe
> >     priv->drvdata->setup_regmaps
> >       dwc3_meson_g12a_setup_regmaps
> >         priv->usb2_ports is still 0 so priv->u2p_regmap[i] will be NULL
> >     dwc3_meson_g12a_get_phys
> >       initializes priv->usb2_ports
> >     priv->drvdata->usb_init
> >       dwc3_meson_g12a_usb_init
> >         dwc3_meson_g12a_usb_init_glue
> >           dwc3_meson_g12a_usb2_init
> >             priv->drvdata->usb2_init_phy
> >               dwc3_meson_g12a_usb2_init_phy
> >                 dereferences priv->u2p_regmap[i]
> > 
> > Call priv->drvdata->setup_regmaps only after dwc3_meson_g12a_get_phys so
> > priv->usb2_ports is initialized and the regmaps will be set up
> > correctly. This fixes the NULL dereference later on.
> > 
> > Fixes: 013af227f58a97 ("usb: dwc3: meson-g12a: handle the phy and glue registers separately")
> > Reported-by: "kernelci.org bot" <bot@...nelci.org>
> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> > ---
> >  drivers/usb/dwc3/dwc3-meson-g12a.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
> > index ce5388338389..1f7f4d88ed9d 100644
> > --- a/drivers/usb/dwc3/dwc3-meson-g12a.c
> > +++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
> 
> [...]
> 
> Fixes regression reported at [1] on SEI510 board based on Amlogic G12A.
> 
> Felipe, Greg, can this be queued on uxb-next for 5.8 ?
> 
> Acked-by: Neil Armstrong <narmstron@...libre.com>

I can take this and patch 1/2 here if Felipe acks them.

thanks,

greg k-h