linux-kernel - Re: [PATCH 05/12] gpu/drm: Ingenic: Fix opaque pointer casted to wrong type

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Message-ID: <20200517062105.GD609600@ravnborg.org>
Date:   Sun, 17 May 2020 08:21:05 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, od@...c.me, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 05/12] gpu/drm: Ingenic: Fix opaque pointer casted to
 wrong type

On Sat, May 16, 2020 at 11:50:50PM +0200, Paul Cercueil wrote:
> The opaque pointer passed to the IRQ handler is a pointer to the
> drm_device, not a pointer to our ingenic_drm structure.
> 
> It still worked, because our ingenic_drm structure contains the
> drm_device as its first field, so the pointer received had the same
> value, but this was not semantically correct.
> 
> Cc: stable@...r.kernel.org # v5.3
> Fixes: 90b86fcc47b4 ("DRM: Add KMS driver for the Ingenic JZ47xx SoCs")
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Acked-by: Sam Ravnborg <sam@...nborg.org>
> ---
>  drivers/gpu/drm/ingenic/ingenic-drm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
> index 0c472382a08b..97244462599b 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> @@ -476,7 +476,7 @@ static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder,
>  
>  static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
>  {
> -	struct ingenic_drm *priv = arg;
> +	struct ingenic_drm *priv = drm_device_get_priv(arg);
>  	unsigned int state;
>  
>  	regmap_read(priv->map, JZ_REG_LCD_STATE, &state);
> -- 
> 2.26.2
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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