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authorDmitry Eremin-Solenikov <dbaryshkov@gmail.com>2011-04-27 23:21:15 +0400
committerHerbert Xu <herbert@gondor.apana.org.au>2011-05-04 09:13:15 +0400
commitbd68ccb390f0d91e26e6f3252ba457ee4e06974a (patch)
treea66d7a020af3596dc2f066a99f2fe9936dbb57d5 /drivers/char/hw_random/amd-rng.c
parent0200f3ecc19660bebeabbcbaf212957fcf1dbf8f (diff)
downloadlinux-bd68ccb390f0d91e26e6f3252ba457ee4e06974a.tar.xz
hwrng: amd - manage resource allocation
As amd driver doesn't bind to PCI device, we'd better manage reource allocation on our own to disallow (possible) conflicts. Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char/hw_random/amd-rng.c')
-rw-r--r--drivers/char/hw_random/amd-rng.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
index 0d8c5788b8e4..c6af038682f1 100644
--- a/drivers/char/hw_random/amd-rng.c
+++ b/drivers/char/hw_random/amd-rng.c
@@ -133,6 +133,12 @@ found:
pmbase &= 0x0000FF00;
if (pmbase == 0)
goto out;
+ if (!request_region(pmbase + 0xF0, 8, "AMD HWRNG")) {
+ dev_err(&pdev->dev, "AMD HWRNG region 0x%x already in use!\n",
+ pmbase + 0xF0);
+ err = -EBUSY;
+ goto out;
+ }
amd_rng.priv = (unsigned long)pmbase;
amd_pdev = pdev;
@@ -141,6 +147,7 @@ found:
if (err) {
printk(KERN_ERR PFX "RNG registering failed (%d)\n",
err);
+ release_region(pmbase + 0xF0, 8);
goto out;
}
out:
@@ -149,6 +156,8 @@ out:
static void __exit mod_exit(void)
{
+ u32 pmbase = (unsigned long)amd_rng.priv;
+ release_region(pmbase + 0xF0, 8);
hwrng_unregister(&amd_rng);
}