ACPI: Clarify resource conflict message

commit 14f03343ad1080c2fea29ab2c13f05b976c4584e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 5691f165a9527f209c7fcac6febbd73cae43bb65..8dff236f7ed360202ad7a2f6f48c6c3c731442a6 100644 (file)
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1182,7 +1182,13 @@ 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;