linux-kernel - Re: [PATCH] iio: adc: meson_saradc: Fix memory allocation order

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Date:   Sun, 1 Sep 2019 13:29:04 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Remi Pommarel <repk@...plefau.lt>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Elie Roudninski <xademax@...il.com>
Subject: Re: [PATCH] iio: adc: meson_saradc: Fix memory allocation order

On Sun, Sep 1, 2019 at 12:45 PM Remi Pommarel <repk@...plefau.lt> wrote:
>
> meson_saradc's irq handler uses priv->regmap so make sure that it is
> allocated before the irq get enabled.
>
> This also fixes crash when CONFIG_DEBUG_SHIRQ is enabled, as device
> managed resources are freed in the inverted order they had been
> allocated, priv->regmap was freed before the spurious fake irq that
> CONFIG_DEBUG_SHIRQ adds called the handler.
>

Fixes: 3af109131b7eb8 ("iio: adc: meson-saradc: switch from polling to
interrupt mode")
> Reported-by: Elie Roudninski <xademax@...il.com>
> Signed-off-by: Remi Pommarel <repk@...plefau.lt>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

thank you for fixing this!


Martin