Public bug reported:
[Impact]
dcci-dkms is failing with the following build error on focal with the
new 5.15 hwe kernel:
CC [M] /var/lib/dkms/ddcci/0.3.3/build/ddcci/ddcci.o
/var/lib/dkms/ddcci/0.3.3/build/ddcci/ddcci.c:1222:13: error: initialization of
‘void (*)(struct device *)’ from incompatible pointer type ‘int (*)(struct
device *)’ [-Werror=incompatible-pointer-types]
1222 | .remove = ddcci_device_remove
| ^~~~~~~~~~~~~~~~~~~
/var/lib/dkms/ddcci/0.3.3/build/ddcci/ddcci.c:1222:13: note: (near
initialization for ‘ddcci_bus_type.remove’)
cc1: some warnings being treated as errors
[Fix]
Prototype of bus_type->remove() is changed starting with kernel 5.15
(function is not returning an int anymore, now it's a void function).
Fix with a proper #ifdef macro to support both prototypes, based on the
specific kernel version that we are building against to.
[Test case]
$ sudo apt install ddcci-dkms
[Regression potential]
We may see stale devices / resource leaking on removal of ddcci devices,
because with kernels >= 5.15 there's basically no error handling in
bus_type->remove(). Previous kernels are unaffected, because the code
remains identical.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1959911
Title:
ddcci-dkms fails to install with linux 5.15 on focal
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