linux-kernel - Re: [PATCH v2 08/10] drm/msm/hdmi: fix IRQ lifetime

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Message-ID: <9e223c13-15e2-de5e-e1e1-0dbbe629a0a1@quicinc.com>
Date:   Thu, 22 Sep 2022 12:55:03 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Rob Clark" <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.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>,
        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>,
        Steev Klimaszewski <steev@...i.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 v2 08/10] drm/msm/hdmi: fix IRQ lifetime


On 9/13/2022 1:53 AM, 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 HDMI IRQ, which will otherwise remain
> requested so that the next bind attempt fails when requesting the IRQ a
> second time.
>
> Fix this by tying the device-managed lifetime of the HDMI IRQ to the DRM
> device so that it is released when bind fails.
>
> Fixes: 067fef372c73 ("drm/msm/hdmi: refactor bind/init")
> Cc: stable@...r.kernel.org      # 3.19
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

> Tested-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> Reviewed-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

> ---
>   drivers/gpu/drm/msm/hdmi/hdmi.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> index a0ed6aa8e4e1..f28fb21e3891 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> @@ -344,7 +344,7 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
>   		goto fail;
>   	}
>   
> -	ret = devm_request_irq(&pdev->dev, hdmi->irq,
> +	ret = devm_request_irq(dev->dev, hdmi->irq,
>   			msm_hdmi_irq, IRQF_TRIGGER_HIGH,
>   			"hdmi_isr", hdmi);
>   	if (ret < 0) {