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hwrng: omap - Convert release_resource to release_region/release_mem_region 

Request_region should be used with release_region, not release_resource.

The local variable mem, storing the result of request_mem_region, is
dropped and instead the pointer res is stored in the drvdata field of the
platform device.  This information is retrieved in omap_rng_remove to
release the region.  The drvdata field is not used elsewhere.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,E;
@@
(
*x = request_region(...)
|
*x = request_mem_region(...)
)
... when != release_region(x)
    when != x = E
* release_resource(x);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Julia Lawall 2011-02-16 13:05:54 +11:00 committed by Herbert Xu
parent fc9044e2db
commit c652759b6a
1 changed files with 6 additions and 8 deletions
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14
drivers/char/hw_random/omap-rng.c
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@ -91,7 +91,7 @@ static struct hwrng omap_rng_ops = {
static int __devinit omap_rng_probe(struct platform_device *pdev)
{
struct resource *res, *mem;
struct resource *res;
int ret;
/*
@ -116,14 +116,12 @@ static int __devinit omap_rng_probe(struct platform_device *pdev)
if (!res)
return -ENOENT;
mem = request_mem_region(res->start, resource_size(res),
pdev->name);
if (mem == NULL) {
if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
ret = -EBUSY;
goto err_region;
}
dev_set_drvdata(&pdev->dev, mem);
dev_set_drvdata(&pdev->dev, res);
rng_base = ioremap(res->start, resource_size(res));
if (!rng_base) {
ret = -ENOMEM;
@ -146,7 +144,7 @@ err_register:
iounmap(rng_base);
rng_base = NULL;
err_ioremap:
release_resource(mem);
release_mem_region(res->start, resource_size(res));
err_region:
if (cpu_is_omap24xx()) {
clk_disable(rng_ick);
@ -157,7 +155,7 @@ err_region:
static int __exit omap_rng_remove(struct platform_device *pdev)
{
struct resource *mem = dev_get_drvdata(&pdev->dev);
struct resource *res = dev_get_drvdata(&pdev->dev);
hwrng_unregister(&omap_rng_ops);
@ -170,7 +168,7 @@ static int __exit omap_rng_remove(struct platform_device *pdev)
clk_put(rng_ick);
}
release_resource(mem);
release_mem_region(res->start, resource_size(res));
rng_base = NULL;
return 0;