linux-kernel - Re: [PATCH v5 05/20] Input: axp20x-pek: Bail out if AXP has no interrupt line connected

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Message-ID: <YBHCF2tWIX4MeMia@google.com>
Date:   Wed, 27 Jan 2021 11:42:15 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Samuel Holland <samuel@...lland.org>,
        Icenowy Zheng <icenowy@...c.io>, Rob Herring <robh@...nel.org>,
        Clément Péron <peron.clem@...il.com>,
        Shuosheng Huang <huangshuosheng@...winnertech.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Lee Jones <lee.jones@...aro.org>,
        linux-input@...r.kernel.org
Subject: Re: [PATCH v5 05/20] Input: axp20x-pek: Bail out if AXP has no
 interrupt line connected

Hi Andre,

On Wed, Jan 27, 2021 at 05:24:45PM +0000, Andre Przywara wrote:
> On at least one board (Orangepi Zero2) the AXP305 PMIC does not have its
> interrupt line connected to the CPU (mostly because the H616 SoC does
> not feature an NMI pin anymore).
> After allowing the AXP driver to proceed without an "interrupts"
> property [1], the axp20x-pek driver crashes with a NULL pointer
> dereference (see below).
> 
> Check for the regmap_irqc member to be not NULL before proceeding with
> probe. This gets normally filled by the call to regmap_add_irq_chip(),
> which we allow to skip now, when the DT node lacks an interrupt
> property.

No, the driver is not the right place to patch this; regmap should be
fixed so it does not crash instead.

Thanks.

-- 
Dmitry