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authorJean Delvare <khali@linux-fr.org>2010-05-27 19:58:37 +0200
committerJean Delvare <khali@linux-fr.org>2010-05-27 19:58:37 +0200
commit70dd6beac02f43a5099fcf5fddf68cfee0cbf479 (patch)
tree53d70a87157eafdf62612922a137fcc365439688 /drivers/hwmon/asus_atk0110.c
parentMerge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/air... (diff)
downloadlinux-70dd6beac02f43a5099fcf5fddf68cfee0cbf479.tar.xz
linux-70dd6beac02f43a5099fcf5fddf68cfee0cbf479.zip
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>
Diffstat (limited to 'drivers/hwmon/asus_atk0110.c')
-rw-r--r--drivers/hwmon/asus_atk0110.c7
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);