hwmon: (asus_atk0110) Don't load if ACPI resources aren't enforced

When the user passes the kernel parameter acpi_enforce_resources=lax,
the ACPI resources are no longer protected, so a native driver can
make use of them. In that case, we do not want the asus_atk0110 to be
loaded. Unfortunately, this driver loads automatically due to its
MODULE_DEVICE_TABLE, so the user ends up with two drivers loaded for
the same device - this is bad.

So I suggest that we prevent the asus_atk0110 driver from loading if
acpi_enforce_resources=lax.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Luca Tettamanti <kronos.it@gmail.com>
Cc: Len Brown <lenb@kernel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c
index 16c420240724..653db1bda934 100644
--- a/drivers/hwmon/asus_atk0110.c
+++ b/drivers/hwmon/asus_atk0110.c
@@ -1411,6 +1411,13 @@ static int __init atk0110_init(void)
 {
         int ret;
 
+        /* Make sure it's safe to access the device through ACPI */
+        if (!acpi_resources_are_enforced()) {
+                pr_err("atk: Resources not safely usable due to "
+                       "acpi_enforce_resources kernel parameter\n");
+                return -EBUSY;
+        }
+
         ret = acpi_bus_register_driver(&atk_driver);
         if (ret)
                 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);