linux-kernel - Re: [PATCH] pinctrl: mt7622: fix probe fail by misuse the selector

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Message-ID: <20180713124641.GR99251@atomide.com>
Date:   Fri, 13 Jul 2018 05:46:41 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Paul Cercueil <paul@...pouillou.net>
Subject: Re: [PATCH] pinctrl: mt7622: fix probe fail by misuse the selector

* Linus Walleij <linus.walleij@...aro.org> [180713 08:14]:
> On Thu, Jul 12, 2018 at 7:50 AM <sean.wang@...iatek.com> wrote:
> 
> > From: Sean Wang <sean.wang@...iatek.com>
> >
> > After the commit acf137951367 ("pinctrl: core: Return selector to the
> > pinctrl driver") and the commit 47f1242d19c3 ("pinctrl: pinmux: Return
> > selector to the pinctrl driver"), it's necessary to add the fixes
> > needed for the pin controller drivers to use the appropriate returned
> > selector for a negative error number returned in case of the fail at
> > these functions. Otherwise, the driver would have a failed probe and
> > that causes boot message cannot correctly output and devices fail
> > to acquire their own pins.
> >
> > Cc: Kevin Hilman <khilman@...libre.com>
> > Fixes: acf137951367 ("pinctrl: core: Return selector to the pinctrl driver")
> > Fixes: 47f1242d19c3 ("pinctrl: pinmux: Return selector to the pinctrl driver")
> > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> 
> Applied on top of Tony's patches on the fixes branch.
> 
> Now there are fixes piling on top of fixes and I am starting to feel
> insecure of pushing this to v4.18 and I feel like letting these
> fixes go to v4.19 (it can be picked to stable from there).

Yes might be worth waiting as we're getting close to the merge window.

> Tony: do you think there could be more fallout like this?

Based on grep -A5 pinctrl_generic_add we have also:

drivers/pinctrl/pinctrl-ingenic.c

Looks like it should check for if (err < 0). Adding Paul Cercueil
to Cc as well, Paul can you please check and patch?

Then 12f953b382bf ("pinctrl: rza1: Fix selector use for groups and
functions") seems to have fixed a similar issue for
drivers/pinctrl/pinctrl-rza1.c

Regards,

Tony