linux-kernel - Re: [PATCH] phy: rockchip-inno-usb2: Return zero after otg sync

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Date:   Tue, 23 Aug 2022 07:46:16 +0200
From:   Peter Geis <pgwipeout@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Markus Reichl <m.reichl@...etechno.de>,
        Michael Riesch <michael.riesch@...fvision.net>,
        "open list:GENERIC PHY FRAMEWORK" <linux-phy@...ts.infradead.org>,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: rockchip-inno-usb2: Return zero after otg sync

On Tue, Aug 23, 2022 at 5:41 AM Samuel Holland <samuel@...lland.org> wrote:
>
> On 8/22/22 5:32 AM, Peter Geis wrote:
> > The otg sync state patch reuses the ret variable, but fails to set it to
> > zero after use. This leads to a situation when the otg port is in
> > peripheral mode where the otg phy aborts halfway through setup. Fix this
> > by setting ret to zero after use.
> >
> > Fixes: 8dc60f8da22f ("phy: rockchip-inno-usb2: Sync initial otg state")
> >
> > Reported-by: Markus Reichl <m.reichl@...etechno.de>
> > Reported-by: Michael Riesch <michael.riesch@...fvision.net>
> > Signed-off-by: Peter Geis <pgwipeout@...il.com>
> > Tested-by: Michael Riesch <michael.riesch@...fvision.net>
> > Tested-by: Markus Reichl <m.reichl@...etechno.de>
> > ---
> >  drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> > index 0b1e9337ee8e..5fc7c374a6b4 100644
> > --- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> > +++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> > @@ -1169,6 +1169,7 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
> >                       /* do initial sync of usb state */
> >                       ret = property_enabled(rphy->grf, &rport->port_cfg->utmi_id);
> >                       extcon_set_state_sync(rphy->edev, EXTCON_USB_HOST, !ret);
> > +                     ret = 0;
>
> The bug was caused by the unexpected consequence of (mis|re)using the "ret"
> variable for a temporary value. Please introduce a new variable here, else the
> use of "ret" is even more confusing. This code also wipes out any error returned
> by devm_extcon_register_notifier().

I see your point here, I also need to skip this if
devm_extcon_register_notifier() fails as well. I'll spin up a v2.

Thanks for catching that!

>
> Regards,
> Samuel