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>
diff --git a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
index 5161aaf..496ee87 100644
--- a/drivers/i2c/busses/i2c-pca-isa.c
+++ b/drivers/i2c/busses/i2c-pca-isa.c
@@ -125,6 +125,13 @@
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;
