linux-kernel - Re: [PATCH 3/7] drm/msm/dp: fix IRQ lifetime

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Message-ID: <9ac13738-ea89-e2de-6316-ab8020580569@linaro.org>
Date:   Mon, 12 Sep 2022 21:06:47 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...il.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 3/7] drm/msm/dp: fix IRQ lifetime

On 12/09/2022 18:40, Johan Hovold wrote:
> Device-managed resources allocated post component bind must be tied to
> the lifetime of the aggregate DRM device or they will not necessarily be
> released when binding of the aggregate device is deferred.
> 
> This is specifically true for the DP IRQ, which will otherwise remain
> requested so that the next bind attempt fails when requesting the IRQ a
> second time.
> 
> Since commit c3bf8e21b38a ("drm/msm/dp: Add eDP support via aux_bus")
> this can happen when the aux-bus panel driver has not yet been loaded so
> that probe is deferred.
> 
> Fix this by tying the device-managed lifetime of the DP IRQ to the DRM
> device so that it is released when bind fails.
> 
> Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
> Cc: stable@...r.kernel.org      # 5.10
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/dp/dp_display.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index fbe950edaefe..ba557328710a 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1258,7 +1258,7 @@ int dp_display_request_irq(struct msm_dp *dp_display)
>   		return -EINVAL;
>   	}
>   
> -	rc = devm_request_irq(&dp->pdev->dev, dp->irq,
> +	rc = devm_request_irq(dp_display->drm_dev->dev, dp->irq,
>   			dp_display_irq_handler,
>   			IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
>   	if (rc < 0) {

-- 
With best wishes
Dmitry