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Message-ID: <9b678e3a-58d2-44de-8dcb-573f4d9c2ced@ideasonboard.com>
Date: Thu, 1 Feb 2024 09:41:27 +0200
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Subject: Re: [PATCH v3 4/5] drm: xlnx: zynqmp_dpsub: Filter interrupts against
 mask
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To: Anatoliy Klymenko <anatoliy.klymenko@amd.com>
References: <20240124025402.373620-1-anatoliy.klymenko@amd.com>
 <20240124025402.373620-5-anatoliy.klymenko@amd.com>
From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Cc: laurent.pinchart@ideasonboard.com, maarten.lankhorst@linux.intel.com,
 mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, daniel@ffwll.ch,
 michal.simek@amd.com, dri-devel@lists.freedesktop.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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In-Reply-To: <20240124025402.373620-5-anatoliy.klymenko@amd.com>
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On 24/01/2024 04:54, Anatoliy Klymenko wrote:
> Filter out status register against the interrupts' mask.
> 
> Some events are being reported via DP status register, even if
> corresponding interrupts have been disabled. One instance of such event
> leads to generation of VBLANK when the driver is in DRM bridge mode,
> which in turn results in NULL pointer dereferencing. We should avoid
> processing such events in an interrupt handler context.
> 
> This problem is less noticeable when the driver operates in DMA mode, as
> in this case we have DRM CRTC object instantiated and DRM framework
> simply discards unwanted VBLANKs in drm_handle_vblank().
> 
> Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@amd.com>
> ---
>   drivers/gpu/drm/xlnx/zynqmp_dp.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> index 5a3335e1fffa..9f48e5bbcdec 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> @@ -1627,7 +1627,14 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
>   	/* clear status register as soon as we read it */
>   	zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
>   	mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
> -	if (!(status & ~mask))
> +
> +	/*
> +	 * Status register may report some events, which corresponding interrupts
> +	 * have been disabled. Filter out those events against interrupts' mask.
> +	 */
> +	status &= ~mask;
> +
> +	if (!status)
>   		return IRQ_NONE;
>   
>   	/* dbg for diagnostic, but not much that the driver can do */

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

  Tomi