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Subject[PATCH] [HWRNG] fixed timeriomem-rng to use a phys address rather than virt
[HWRNG] fixed timeriomem-rng to use a 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>
---
drivers/char/hw_random/timeriomem-rng.c | 39 +++++++++++++++++++++++++++---
include/linux/timeriomem-rng.h | 2 +-
2 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c
index 10ad41b..dcd352a 100644
--- 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
--- 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;
--
1.6.2

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