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Message-Id: <1303932076-7428-1-git-send-email-dbaryshkov@gmail.com>
Date:	Wed, 27 Apr 2011 23:21:15 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 1/2] hwrng: manage resource allocation in amd driver

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@...il.com>
---
 drivers/char/hw_random/amd-rng.c |    9 +++++++++
 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 0d8c578..c6af038 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);
 }
 
-- 
1.7.4.4

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