lkml.org 
[lkml]   [2012]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 6/6] i2c: davinci: use devm_ functions
Date
From: Julia Lawall <Julia.Lawall@lip6.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.

The call to platform_get_resource is moved down to the call to
devm_request_and_ioremap that uses it.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
Not compiled.
I was not sure what to do with the comment on the first line, so I just
left it where it is.
I was also concerned about the calls to get_device and put_device, and
whether they would cause &pdev->dev to be freed before the devm-allocated
objects were freed. Most other platform drivers don't seem to have these
calls.

drivers/i2c/busses/i2c-davinci.c | 51 +++++++++------------------------------
1 file changed, 12 insertions(+), 39 deletions(-)

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index b6185dc..c8e9c87 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -647,30 +647,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
int r;

/* NOTE: driver uses the static register mapping */
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem) {
- dev_err(&pdev->dev, "no mem resource?\n");
- return -ENODEV;
- }
-
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq) {
dev_err(&pdev->dev, "no irq resource?\n");
return -ENODEV;
}

- ioarea = request_mem_region(mem->start, resource_size(mem),
- pdev->name);
- if (!ioarea) {
- dev_err(&pdev->dev, "I2C region already claimed\n");
- return -EBUSY;
- }
-
- dev = kzalloc(sizeof(struct davinci_i2c_dev), GFP_KERNEL);
- if (!dev) {
- r = -ENOMEM;
- goto err_release_region;
- }
+ dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_i2c_dev),
+ GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;

init_completion(&dev->cmd_complete);
#ifdef CONFIG_CPU_FREQ
@@ -699,14 +685,15 @@ static int davinci_i2c_probe(struct platform_device *pdev)
dev->pdata = &davinci_i2c_platform_data_default;
}

- dev->clk = clk_get(&pdev->dev, NULL);
+ dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk)) {
r = -ENODEV;
goto err_free_mem;
}
clk_enable(dev->clk);

- dev->base = ioremap(mem->start, resource_size(mem));
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dev->base = devm_request_and_ioremap(&pdev->dev, mem);
if (!dev->base) {
r = -EBUSY;
goto err_mem_ioremap;
@@ -714,16 +701,17 @@ static int davinci_i2c_probe(struct platform_device *pdev)

i2c_davinci_init(dev);

- r = request_irq(dev->irq, i2c_davinci_isr, 0, pdev->name, dev);
+ r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
+ pdev->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
- goto err_unuse_clocks;
+ goto err_mem_ioremap;
}

r = i2c_davinci_cpufreq_register(dev);
if (r) {
dev_err(&pdev->dev, "failed to register cpufreq\n");
- goto err_free_irq;
+ goto err_mem_ioremap;
}

adap = &dev->adapter;
@@ -740,26 +728,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
- goto err_free_irq;
+ goto err_mem_ioremap;
}
of_i2c_register_devices(adap);

return 0;

-err_free_irq:
- free_irq(dev->irq, dev);
-err_unuse_clocks:
- iounmap(dev->base);
err_mem_ioremap:
clk_disable(dev->clk);
- clk_put(dev->clk);
dev->clk = NULL;
err_free_mem:
platform_set_drvdata(pdev, NULL);
put_device(&pdev->dev);
- kfree(dev);
-err_release_region:
- release_mem_region(mem->start, resource_size(mem));

return r;
}
@@ -767,7 +747,6 @@ err_release_region:
static int davinci_i2c_remove(struct platform_device *pdev)
{
struct davinci_i2c_dev *dev = platform_get_drvdata(pdev);
- struct resource *mem;

i2c_davinci_cpufreq_deregister(dev);

@@ -776,16 +755,10 @@ static int davinci_i2c_remove(struct platform_device *pdev)
put_device(&pdev->dev);

clk_disable(dev->clk);
- clk_put(dev->clk);
dev->clk = NULL;

davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0);
- free_irq(dev->irq, dev);
- iounmap(dev->base);
- kfree(dev);

- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(mem->start, resource_size(mem));
return 0;
}



\
 
 \ /
  Last update: 2012-08-25 20:21    [W:0.095 / U:0.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site