linux-kernel - Re: BUG: drivers/pinctrl/core: races in pinctrl

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Message-ID: <20180614120157.GE112168@atomide.com>
Date:   Thu, 14 Jun 2018 05:01:57 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, kernel@...a-handheld.com
Subject: Re: BUG: drivers/pinctrl/core: races in pinctrl_groups and deferred
 probing

* H. Nikolaus Schaller <hns@...delico.com> [180613 12:41]:
> 
> Now if I look into pinctrl_generic_add_group() and pinctrl_generic_get_group_name(),
> pctldev->num_groups++ is not protected if pinctrl_generic_add_group() may be called by
> two threads in parallel for the same pctldev. Hence a second thread may try to insert
> a different node into the radix tree at the same selector index. This fails but there
> is no error check - and the second entry is completely missing (but probably assumed to
> be there).

Sounds like pinctrl-single.c is missing mutex around calls to
pinctrl_generic_add_group()?

Regards,

Tony