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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Message-ID: <87y2pd1qpj.fsf@kernel.org>
Date:   Wed, 27 May 2020 15:56:40 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     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

Greg KH <gregkh@...uxfoundation.org> writes:

> 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.

Sure thing, Greg. Thanks.

Acked-by: Felipe Balbi <balbi@...nel.org>

-- 
balbi

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