hwrng: timeriomem - Use phys address rather than virt

There is no ioremap'ing or anything in timeriomem-rng.c as I foolishly
used already remapped virtual addresses instead of passing the physical
address to be polled.

This patch fixes this flaw and lets developers do the Right Thing(tm).

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c
index 10ad41b..dcd352a 100644 (file)
--- a/drivers/char/hw_random/timeriomem-rng.c
+++ b/drivers/char/hw_random/timeriomem-rng.c
@@ -90,10 +90,30 @@ static struct hwrng timeriomem_rng_ops = {
 
 static int __init timeriomem_rng_probe(struct platform_device *pdev)
 {
+       struct resource *res, *mem;
        int ret;
 
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+       if (!res)
+               return -ENOENT;
+
+       mem = request_mem_region(res->start, res->end - res->start + 1,
+                                pdev->name);
+       if (mem == NULL)
+               return -EBUSY;
+
+       dev_set_drvdata(&pdev->dev, mem);
+
        timeriomem_rng_data = pdev->dev.platform_data;
 
+       timeriomem_rng_data->address = ioremap(res->start,
+                                               res->end - res->start + 1);
+       if (!timeriomem_rng_data->address) {
+               ret = -ENOMEM;
+               goto err_ioremap;
+       }
+
        if (timeriomem_rng_data->period != 0
                && usecs_to_jiffies(timeriomem_rng_data->period) > 0) {
                timeriomem_rng_timer.expires = jiffies;
@@ -104,23 +124,34 @@ static int __init timeriomem_rng_probe(struct platform_device *pdev)
        timeriomem_rng_data->present = 1;
 
        ret = hwrng_register(&timeriomem_rng_ops);
-       if (ret) {
-               dev_err(&pdev->dev, "problem registering\n");
-               return ret;
-       }
+       if (ret)
+               goto err_register;
 
        dev_info(&pdev->dev, "32bits from 0x%p @ %dus\n",
                        timeriomem_rng_data->address,
                        timeriomem_rng_data->period);
 
        return 0;
+
+err_register:
+       dev_err(&pdev->dev, "problem registering\n");
+       iounmap(timeriomem_rng_data->address);
+err_ioremap:
+       release_resource(mem);
+
+       return ret;
 }
 
 static int __devexit timeriomem_rng_remove(struct platform_device *pdev)
 {
+       struct resource *mem = dev_get_drvdata(&pdev->dev);
+
        del_timer_sync(&timeriomem_rng_timer);
        hwrng_unregister(&timeriomem_rng_ops);
 
+       iounmap(timeriomem_rng_data->address);
+       release_resource(mem);
+
        return 0;
 }
 

diff --git a/include/linux/timeriomem-rng.h b/include/linux/timeriomem-rng.h
index dd25317..3e08a1c 100644 (file)
--- a/include/linux/timeriomem-rng.h
+++ b/include/linux/timeriomem-rng.h
@@ -14,7 +14,7 @@ struct timeriomem_rng_data {
        struct completion       completion;
        unsigned int            present:1;
 
-       u32 __iomem             *address;
+       void __iomem            *address;
 
        /* measures in usecs */
        unsigned int            period;