linux-kernel - [PATCH] drm/msm/hdm: Fix the error handling path of msm_hdmi_dev

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Message-Id: <b3d9dac978f1e2e42a40ec61f58aa98c44c85dfd.1670741386.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 11 Dec 2022 07:50:06 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: [PATCH] drm/msm/hdm: Fix the error handling path of msm_hdmi_dev_probe()

If an error occurs after a successful msm_hdmi_get_phy() call, it must be
undone by a corresponding msm_hdmi_put_phy(), as already done in the
remove function.

Fixes: 437365464043 ("drm/msm/hdmi: move msm_hdmi_get_phy() to msm_hdmi_dev_probe()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Not sure if the Fixes tag is correct. At least it is when the probe needs
to be fixed but the issue was maybe there elsewhere before.
---
 drivers/gpu/drm/msm/hdmi/hdmi.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 4d3fdc806bef..97372bb241d8 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -532,11 +532,19 @@ static int msm_hdmi_dev_probe(struct platform_device *pdev)
 
 	ret = devm_pm_runtime_enable(&pdev->dev);
 	if (ret)
-		return ret;
+		goto err_put_phy;
 
 	platform_set_drvdata(pdev, hdmi);
 
-	return component_add(&pdev->dev, &msm_hdmi_ops);
+	ret = component_add(&pdev->dev, &msm_hdmi_ops);
+	if (ret)
+		goto err_put_phy;
+
+	return 0;
+
+err_put_phy:
+	msm_hdmi_put_phy(hdmi);
+	return ret;
 }
 
 static int msm_hdmi_dev_remove(struct platform_device *pdev)
-- 
2.34.1