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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2018-04-23 11:16:56 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-09 09:51:49 +0200
commitc8a622ed9e53a8ac56a52d90920c8f991fc99aaf (patch)
parent63d9df9eb7a587c528d3fd97054835a7bdc430c1 (diff)
ACPI / button: make module loadable when booted in non-ACPI mode
commit ac1e55b1fdb27c1b07a0a6fe519f1291ff1e7d40 upstream. Modules such as nouveau.ko and i915.ko have a link time dependency on acpi_lid_open(), and due to its use of acpi_bus_register_driver(), the button.ko module that provides it is only loadable when booted in ACPI mode. However, the ACPI button driver can be built into the core kernel as well, in which case the dependency can always be satisfied, and the dependent modules can be loaded regardless of whether the system was booted in ACPI mode or not. So let's fix this asymmetry by making the ACPI button driver loadable as a module even if not booted in ACPI mode, so it can provide the acpi_lid_open() symbol in the same way as when built into the kernel. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [ rjw: Minor adjustments of comments, whitespace and names. ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index ef1856b15488..9e80802e3603 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -595,4 +595,26 @@ module_param_call(lid_init_state,
NULL, 0644);
MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
+static int acpi_button_register_driver(struct acpi_driver *driver)
+ /*
+ * Modules such as nouveau.ko and i915.ko have a link time dependency
+ * on acpi_lid_open(), and would therefore not be loadable on ACPI
+ * capable kernels booted in non-ACPI mode if the return value of
+ * acpi_bus_register_driver() is returned from here with ACPI disabled
+ * when this driver is built as a module.
+ */
+ if (acpi_disabled)
+ return 0;
+ return acpi_bus_register_driver(driver);
+static void acpi_button_unregister_driver(struct acpi_driver *driver)
+ if (!acpi_disabled)
+ acpi_bus_unregister_driver(driver);
+module_driver(acpi_button_driver, acpi_button_register_driver,
+ acpi_button_unregister_driver);