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Subject[PATCH 4/5] drivers/video/exynos/exynos_mipi_dsi.c: use devm_ functions
Date
From: Damien Cassou <damien.cassou@lifl.fr>

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@lifl.fr>

---
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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