linux-kernel - [PATCH v2] drm/bridge: Fix error handling in analogix_dp

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Date:   Wed, 20 Apr 2022 01:16:40 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        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>,
        Dave Airlie <airlied@...hat.com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Jyri Sarha <jyri.sarha@....fi>,
        Miaoqian Lin <linmq006@...il.com>,
        Lyude Paul <lyude@...hat.com>,
        Maxime Ripard <maxime@...no.tech>,
        Yakir Yang <kuankuan.y@...il.com>,
        Inki Dae <inki.dae@...sung.com>,
        Heiko Stuebner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/bridge: Fix error handling in analogix_dp_probe

In the error handling path, the clk_prepare_enable() function
call should be balanced by a corresponding 'clk_disable_unprepare()'
call , as already done in the remove function.

Fixes: 3424e3a4f844 ("drm: bridge: analogix/dp: split exynos dp driver to bridge directory")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- remove the wrong return statement.
---
 .../gpu/drm/bridge/analogix/analogix_dp_core.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index eb590fb8e8d0..474ef88015ae 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1698,8 +1698,10 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
 	dp->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(dp->reg_base))
-		return ERR_CAST(dp->reg_base);
+	if (IS_ERR(dp->reg_base)) {
+		ret = PTR_ERR(dp->reg_base);
+		goto err_disable_clk;
+	}
 
 	dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
 
@@ -1711,7 +1713,8 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
 	if (IS_ERR(dp->hpd_gpiod)) {
 		dev_err(dev, "error getting HDP GPIO: %ld\n",
 			PTR_ERR(dp->hpd_gpiod));
-		return ERR_CAST(dp->hpd_gpiod);
+		ret = PTR_ERR(dp->hpd_gpiod);
+		goto err_disable_clk;
 	}
 
 	if (dp->hpd_gpiod) {
@@ -1731,7 +1734,8 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
 
 	if (dp->irq == -ENXIO) {
 		dev_err(&pdev->dev, "failed to get irq\n");
-		return ERR_PTR(-ENODEV);
+		ret = -ENODEV;
+		goto err_disable_clk;
 	}
 
 	ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
@@ -1740,11 +1744,15 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
 					irq_flags, "analogix-dp", dp);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to request irq\n");
-		return ERR_PTR(ret);
+		goto err_disable_clk;
 	}
 	disable_irq(dp->irq);
 
 	return dp;
+
+err_disable_clk:
+	clk_disable_unprepare(dp->clock);
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_probe);
 
-- 
2.17.1