[PATCH 4/5] drivers/video/exynos/exynos_mipi_dsi.c: use devm_ functions

[Damien Cassou]

From: Damien Cassou <damien.cassou@xxxxxxx>

The various devm_ functions allocate memory that is released when a driver
detaches.  This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.

Signed-off-by: Damien Cassou <damien.cassou@xxxxxxx>

---
 drivers/video/exynos/exynos_mipi_dsi.c |   41 ++++++++++++---------------------
 1 file changed, 15 insertions(+), 26 deletions(-)

diff --git a/drivers/video/exynos/exynos_mipi_dsi.c b/drivers/video/exynos/exynos_mipi_dsi.c
index 4bc2b8a..c277a07 100644
--- a/drivers/video/exynos/exynos_mipi_dsi.c
+++ b/drivers/video/exynos/exynos_mipi_dsi.c
@@ -336,7 +336,8 @@ static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 	struct mipi_dsim_ddi *dsim_ddi;
 	int ret = -EINVAL;
 
-	dsim = kzalloc(sizeof(struct mipi_dsim_device), GFP_KERNEL);
+	dsim = devm_kzalloc(&pdev->dev, sizeof(struct mipi_dsim_device),
+			    GFP_KERNEL);
 	if (!dsim) {
 		dev_err(&pdev->dev, "failed to allocate dsim object.\n");
 		return -ENOMEM;
@@ -350,13 +351,13 @@ static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 	dsim_pd = (struct mipi_dsim_platform_data *)dsim->pd;
 	if (dsim_pd == NULL) {
 		dev_err(&pdev->dev, "failed to get platform data for dsim.\n");
-		goto err_clock_get;
+		goto err_platform_get_irq;
 	}
 	/* get mipi_dsim_config. */
 	dsim_config = dsim_pd->dsim_config;
 	if (dsim_config == NULL) {
 		dev_err(&pdev->dev, "failed to get dsim config data.\n");
-		goto err_clock_get;
+		goto err_platform_get_irq;
 	}
 
 	dsim->dsim_config = dsim_config;
@@ -367,13 +368,13 @@ static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 	ret = regulator_bulk_get(&pdev->dev, ARRAY_SIZE(supplies), supplies);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to get regulators: %d\n", ret);
-		goto err_clock_get;
+		goto err_platform_get_irq;
 	}
 
-	dsim->clock = clk_get(&pdev->dev, "dsim0");
+	dsim->clock = devm_clk_get(&pdev->dev, "dsim0");
 	if (IS_ERR(dsim->clock)) {
 		dev_err(&pdev->dev, "failed to get dsim clock source\n");
-		goto err_clock_get;
+		goto err_platform_get_irq;
 	}
 
 	clk_enable(dsim->clock);
@@ -384,15 +385,17 @@ static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 		goto err_platform_get;
 	}
 
-	dsim->res = request_mem_region(res->start, resource_size(res),
-					dev_name(&pdev->dev));
+	dsim->res = devm_request_mem_region(&pdev->dev, res->start,
+					    resource_size(res),
+					    dev_name(&pdev->dev));
 	if (!dsim->res) {
 		dev_err(&pdev->dev, "failed to request io memory region\n");
 		ret = -ENOMEM;
-		goto err_mem_region;
+		goto err_platform_get;
 	}
 
-	dsim->reg_base = ioremap(res->start, resource_size(res));
+	dsim->reg_base = devm_ioremap(&pdev->dev, res->start,
+				      resource_size(res));
 	if (!dsim->reg_base) {
 		dev_err(&pdev->dev, "failed to remap io region\n");
 		ret = -ENOMEM;
@@ -405,7 +408,7 @@ static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 	dsim_ddi = exynos_mipi_dsi_bind_lcd_ddi(dsim, dsim_pd->lcd_panel_name);
 	if (!dsim_ddi) {
 		dev_err(&pdev->dev, "mipi_dsim_ddi object not found.\n");
-		goto err_bind;
+		goto err_ioremap;
 	}
 
 	dsim->irq = platform_get_irq(pdev, 0);
@@ -424,7 +427,7 @@ static int exynos_mipi_dsi_probe(struct platform_device *pdev)
 	if (ret != 0) {
 		dev_err(&pdev->dev, "failed to request dsim irq\n");
 		ret = -EINVAL;
-		goto err_bind;
+		goto err_ioremap;
 	}
 
 	/* enable interrupts */
@@ -466,20 +469,11 @@ done:
 
 	return 0;
 
-err_bind:
-	iounmap(dsim->reg_base);
-
 err_ioremap:
 	release_mem_region(dsim->res->start, resource_size(dsim->res));
 
-err_mem_region:
-	release_resource(dsim->res);
-
 err_platform_get:
 	clk_disable(dsim->clock);
-	clk_put(dsim->clock);
-err_clock_get:
-	kfree(dsim);
 
 err_platform_get_irq:
 	return ret;
@@ -491,12 +485,8 @@ static int __devexit exynos_mipi_dsi_remove(struct platform_device *pdev)
 	struct mipi_dsim_ddi *dsim_ddi, *next;
 	struct mipi_dsim_lcd_driver *dsim_lcd_drv;
 
-	iounmap(dsim->reg_base);
-
 	clk_disable(dsim->clock);
-	clk_put(dsim->clock);
 
-	release_resource(dsim->res);
 	release_mem_region(dsim->res->start, resource_size(dsim->res));
 
 	list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
@@ -514,7 +504,6 @@ static int __devexit exynos_mipi_dsi_remove(struct platform_device *pdev)
 	}
 
 	regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
-	kfree(dsim);
 
 	return 0;
 }

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