From 104cb574feb3033299568483a3f68031f47e0d43 Mon Sep 17 00:00:00 2001
From: Christian Krafft <krafft@de.ibm.com>
Date: Sun, 24 Feb 2008 20:03:42 +0100
Subject: i2c-pca-isa: Add access check to legacy ioports

When probing i2c-pca-isa writes to legacy ioports, which crashes the kernel
if there is no device at that port.
This patch adds a check_legacy_ioport call, so probe fails gracefully
and thus prevents the oops.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
---
 drivers/i2c/busses/i2c-pca-isa.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'drivers')

diff --git a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
index 5161aaf9341b..496ee875eb4f 100644
--- a/drivers/i2c/busses/i2c-pca-isa.c
+++ b/drivers/i2c/busses/i2c-pca-isa.c
@@ -125,6 +125,13 @@ static int __devinit pca_isa_probe(struct device *dev, unsigned int id)
 
 	dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);
 
+#ifdef CONFIG_PPC_MERGE
+	if (check_legacy_ioport(base)) {
+		dev_err(dev, "I/O address %#08lx is not available\n", base);
+		goto out;
+	}
+#endif
+
 	if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
 		dev_err(dev, "I/O address %#08lx is in use\n", base);
 		goto out;
-- 
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