From: Frank Seidel <fseidel@xxxxxxx>
Let acpi_bus_register_driver report -ENODEV if
there was no driver attached to a device.
Signed-off-by: Frank Seidel <fseidel@xxxxxxx>
---
drivers/acpi/scan.c | 8 ++++++++
1 files changed, 8 insertions(+)
Index: linux-2.6/drivers/acpi/scan.c
===================================================================
--- linux-2.6.orig/drivers/acpi/scan.c
+++ linux-2.6/drivers/acpi/scan.c
@@ -596,15 +596,23 @@ static void acpi_driver_detach(struct ac
*/
int acpi_bus_register_driver(struct acpi_driver *driver)
{
+ int count;
if (acpi_disabled)
return -ENODEV;
+ count = atomic_read(&driver->references);
spin_lock(&acpi_device_lock);
list_add_tail(&driver->node, &acpi_bus_drivers);
spin_unlock(&acpi_device_lock);
acpi_driver_attach(driver);
+ /* Return error if there were no devices this
+ * driver was additionally attached to.
+ */
+ if (atomic_read(&driver->references) == count)
+ return -ENODEV;
+
return 0;
}
--
-
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