René Treffer reported that booting a CONFIG_THINKPAD_ACPI=y kernel on a machine without the hardware results in an Oops.
The trace is thinkpad_acpi_module_init -> thinkpad_acpi_module_exit -> driver_remove_file -> sysfs_hash_and_remove.
The error handling if thinkpad_acpi_module_init() fails generally looks suspicious, but this patch at least fixes the common case if no hardware was found, and it seems in this case there isn't any cleanup actually required.
Broken by commit d5a2f2f1d68e2da538ac28540cddd9ccc733b001.
Signed-off-by: Adrian Bunk <bunk@xxxxxxxxx>
---bfa7bcd2b872f2c20afa7f7260d9be7dffe92d2e diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.cindex fa80f35..c7432a7 100644--- a/drivers/misc/thinkpad_acpi.c+++ b/drivers/misc/thinkpad_acpi.c@@ -4644,10 +4644,8 @@ static int __init thinkpad_acpi_module_init(void) get_thinkpad_model_data(&thinkpad_id); ret = probe_for_thinkpad();- if (ret) {- thinkpad_acpi_module_exit();+ if (ret) return ret;- } /* Driver initialization */
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