ACPI: Clarify resource conflict message

The message "ACPI: Device needs an ACPI driver" is misleading. The
device _may_ need an ACPI driver, if the BIOS implemented a custom
API for the device in question (which, AFAIK, can't be checked.) If
not, then either a generic ACPI driver may be used (for example
"thermal"), or nothing can be done (other than a white list).

I propose to reword the message to:

ACPI: If an ACPI driver is available for this device, you should use
it instead of the native driver

which I think is more correct. Comments and suggestions welcome.

I also added a message warning about possible problems and system
instability when users pass acpi_enforce_resources=lax, as suggested
by Len.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Alan Jenkins <sourcejedi.lkml@googlemail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 5633b86e3ed1..7c1c59ea9ec6 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1161,7 +1161,13 @@ int acpi_check_resource_conflict(struct resource *res)
                                res_list_elem->name,
                                (long long) res_list_elem->start,
                                (long long) res_list_elem->end);
-                        printk(KERN_INFO "ACPI: Device needs an ACPI driver\n");
+                        if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
+                                printk(KERN_NOTICE "ACPI: This conflict may"
+                                       " cause random problems and system"
+                                       " instability\n");
+                        printk(KERN_INFO "ACPI: If an ACPI driver is available"
+                               " for this device, you should use it instead of"
+                               " the native driver\n");
                 }
                 if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
                         return -EBUSY;