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>

1 files changed, 6 insertions, 8 deletions

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 06aad0831c73..2cc755a64302 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -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;