Build failure on kernel 6.1.x: incompatible `platform_driver->remove` signature

[darioackermann]

Description

The DKMS module fails to build on recent kernels (tested on 6.1.165-1-MANJARO) due to an incompatible function pointer type for the platform_driver->remove callback.

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Error output

error: assignment to 'int (*)(struct platform_device *)'
from incompatible pointer type 'void (*)(struct platform_device *)'

platform_driver->remove = asus_fan_remove;

note: 'asus_fan_remove' declared here
static void asus_fan_remove(struct platform_device *device)

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Cause

The kernel expects the remove callback to have the signature:

int (*remove)(struct platform_device *)

However, the module defines:

static void asus_fan_remove(struct platform_device *device)

This results in a build failure due to the mismatched return type.

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Proposed fix

Change the function signature to return int and add a return value:

static int asus_fan_remove(struct platform_device *device) {
    ...
    return 0;
}

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Environment

• Kernel: 6.1.165-1-MANJARO (x86_64)
• DKMS: 3.3.0
• Distribution: Manjaro Linux