linux-kernel - Re: [Patch 2/2] powerpc: i2c-isa: add access check to legacy ioports

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Message-ID: <20080213183701.254391cc@de.ibm.com>
Date:	Wed, 13 Feb 2008 18:37:01 +0100
From:	Christian Krafft <krafft@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	parabelboi@...serverein.de, linuxppc-dev@...abs.org
Subject: Re: [Patch 2/2] powerpc: i2c-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 failes gracefully
and thus prevents the oops.

Signed-off-by: Christian Krafft <krafft@...ibm.com>

Index: linux.git/drivers/i2c/busses/i2c-pca-isa.c
===================================================================
--- linux.git.orig/drivers/i2c/busses/i2c-pca-isa.c
+++ linux.git/drivers/i2c/busses/i2c-pca-isa.c
@@ -125,6 +125,13 @@ static int __devinit pca_isa_probe(struc
 
 	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;


-- 
Mit freundlichen Gruessen,
kind regards,

Christian Krafft
IBM Systems & Technology Group,
Linux Kernel Development
IT Specialist


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