From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Sat, 16 May 2020 10:57:36 +0000 (+0200)
Subject: drm/exynos: dsi: Remove bridge node reference in error handling path in probe function
X-Git-Tag: baikal/mips/sdk5.9~13559^2~6^2~1
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=ecc75fd3ce00eb1d546f66ac9984f72b6973eefa;p=kernel.git

drm/exynos: dsi: Remove bridge node reference in error handling path in probe function

'exynos_dsi_parse_dt()' takes a reference to 'dsi->in_bridge_node'.
This must be released in the error handling path.

In order to do that, add an error handling path and move the
'exynos_dsi_parse_dt()' call from the beginning to the end of the probe
function to ease the error handling path.
This function only sets some variables which are used only in the
'transfer' function.

The call chain is:
   .transfer
    --> exynos_dsi_host_transfer
      --> exynos_dsi_init
        --> exynos_dsi_enable_clock  (use burst_clk_rate and esc_clk_rate)
          --> exynos_dsi_set_pll     (use pll_clk_rate)

While at it, also handle cases where 'component_add()' fails.

This patch is similar to commit 43491a3bd6e4 ("drm/exynos: dsi: Remove bridge node reference in removal")
which fixed the issue in the remove function.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
---

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index eb1486d2dd227..ee96a95fb6be5 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1759,10 +1759,6 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	dsi->dev = dev;
 	dsi->driver_data = of_device_get_match_data(dev);
 
-	ret = exynos_dsi_parse_dt(dsi);
-	if (ret)
-		return ret;
-
 	dsi->supplies[0].supply = "vddcore";
 	dsi->supplies[1].supply = "vddio";
 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dsi->supplies),
@@ -1821,11 +1817,25 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	ret = exynos_dsi_parse_dt(dsi);
+	if (ret)
+		return ret;
+
 	platform_set_drvdata(pdev, &dsi->encoder);
 
 	pm_runtime_enable(dev);
 
-	return component_add(dev, &exynos_dsi_component_ops);
+	ret = component_add(dev, &exynos_dsi_component_ops);
+	if (ret)
+		goto err_disable_runtime;
+
+	return 0;
+
+err_disable_runtime:
+	pm_runtime_disable(dev);
+	of_node_put(dsi->in_bridge_node);
+
+	return ret;
 }
 
 static int exynos_dsi_remove(struct platform_device *pdev)