i2c: Check for ACPI resource conflicts

Check for ACPI resource conflicts in i2c bus drivers. I've included
all recent SMBus master drivers for PC hardware.

I've voluntarily left out:
* Drivers that don't run on PCs: they can't conflict with ACPI.
* Bit-banged bus device drivers: it's very unlikely that ACPI would
  deal with such buses.

Signed-off-by: Jean Delvare <jdelvare@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 46aa41f73fdd..8d0bc4bfe154 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -64,6 +64,7 @@
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
+#include <linux/acpi.h>
 #include <asm/io.h>
 
 /* I801 SMBus address offsets */
@@ -624,6 +625,10 @@ static int __devinit i801_probe(struct pci_dev *dev, const struct pci_device_id
                 goto exit;
         }
 
+        err = acpi_check_resource_conflict(&dev->resource[SMBBAR]);
+        if (err)
+                goto exit;
+
         err = pci_request_region(dev, SMBBAR, i801_driver.name);
         if (err) {
                 dev_err(&dev->dev, "Failed to request SMBus region "