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| author | Alexander Clouter <alex@digriz.org.uk> | 2009-03-27 12:59:54 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2009-03-27 12:59:54 +0800 |
| commit | 3341323bb4c198f704cffbfdda37bcec1226ef7d (patch) | |
| tree | 6fa9d807e9ccd3e6e0eb75cea990317dbd68fcf1 /drivers/char/hw_random | |
| parent | be0ea69674ed95e1e98cb3687a241badc756d228 (diff) | |
| download | linux-3341323bb4c198f704cffbfdda37bcec1226ef7d.tar.gz linux-3341323bb4c198f704cffbfdda37bcec1226ef7d.tar.bz2 linux-3341323bb4c198f704cffbfdda37bcec1226ef7d.zip | |
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>
Diffstat (limited to 'drivers/char/hw_random')
| -rw-r--r-- | drivers/char/hw_random/timeriomem-rng.c | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c index 10ad41be5897..dcd352ad0e7f 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; } |