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>
diff --git a/drivers/i2c/busses/i2c-isch.c b/drivers/i2c/busses/i2c-isch.c
index 8d64891..b9c01aa 100644
--- a/drivers/i2c/busses/i2c-isch.c
+++ b/drivers/i2c/busses/i2c-isch.c
@@ -35,6 +35,7 @@
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/acpi.h>
/* SCH SMBus address offsets */
#define SMBHSTCNT (0 + sch_smba)
@@ -279,6 +280,8 @@
dev_err(&dev->dev, "SMBus base address uninitialized!\n");
return -ENODEV;
}
+ if (acpi_check_region(sch_smba, SMBIOSIZE, sch_driver.name))
+ return -EBUSY;
if (!request_region(sch_smba, SMBIOSIZE, sch_driver.name)) {
dev_err(&dev->dev, "SMBus region 0x%x already in use!\n",
sch_smba);