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gpio: timberdale: Switch to devm_ioremap_resource()

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Replace calls to devm_request_mem_region and devm_ioremap with a
direct call to devm_ioremap_resource instead and modify error
handling.

Move the call to platform_get_resource adjacent to the call to
devm_ioremap_resource to make the connection between them more
clear.

A simplified version of the Coccinelle semantic patch that is used to
make this change is as follows:
//<smpl>
@nm@
expression myname;
identifier i;
@@

struct platform_driver i = { .driver = { .name = myname } };

@@
expression dev,res,size,e1,e;
expression nm.myname;
@@

-if (!devm_request_mem_region(dev, res->start, size,
-                              \(res->name\|dev_name(dev)\|myname\)))
                               {
-   ...
-   return ...;
-}
... when != res->start = e1
e =
-devm_ioremap(dev,res->start,size);
+devm_ioremap_resource(dev,res);

if
-(e == NULL)
+(IS_ERR(e))
{
 ...
-return ...;
+return PTR_ERR(e);
}
//</smpl>

Further, updated error handling by hand as devm_ioremap_resource
gives appropriate error messages, so remove unnecessary error
messages.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Amitoj Kaur Chawla 2016-02-28 18:00:56 +05:30 committed by Linus Walleij
parent 6dcfd7291b
commit fa283db76f
1 changed files with 4 additions and 17 deletions
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21
drivers/gpio/gpio-timberdale.c
View file

@ -237,12 +237,6 @@ static int timbgpio_probe(struct platform_device *pdev)
return -EINVAL;
}
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iomem) {
dev_err(dev, "Unable to get resource\n");
return -EINVAL;
}
tgpio = devm_kzalloc(dev, sizeof(struct timbgpio), GFP_KERNEL);
if (!tgpio) {
dev_err(dev, "Memory alloc failed\n");
@ -252,17 +246,10 @@ static int timbgpio_probe(struct platform_device *pdev)
spin_lock_init(&tgpio->lock);
if (!devm_request_mem_region(dev, iomem->start, resource_size(iomem),
DRIVER_NAME)) {
dev_err(dev, "Region already claimed\n");
return -EBUSY;
}
tgpio->membase = devm_ioremap(dev, iomem->start, resource_size(iomem));
if (!tgpio->membase) {
dev_err(dev, "Cannot ioremap\n");
return -ENOMEM;
}
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
tgpio->membase = devm_ioremap_resource(dev, iomem);
if (IS_ERR(tgpio->membase))
return PTR_ERR(tgpio->membase);
gc = &tgpio->gpio;