** Also affects: backport-iwlwifi-dkms (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1951580
Title:
backport-iwlwifi-dkms fails to build with kernel 5.15 jammy
Status in backport-iwlwifi-dkms package in Ubuntu:
New
Status in linux package in Ubuntu:
Incomplete
Status in backport-iwlwifi-dkms source package in Jammy:
New
Status in linux source package in Jammy:
Incomplete
Bug description:
[Impact]
backport-iwlwifi-dkms fails to build on the latest jammy kernel 5.15:
CC [M]
/tmp/backport-iwlwifi-dkms/drivers/net/wireless/intel/iwlwifi/mei/main.o
In file included from
/tmp/backport-iwlwifi-dkms/backport-include/asm-generic/bug.h:3,
from ./arch/x86/include/asm/bug.h:84,
from ./include/linux/bug.h:5,
from
/tmp/backport-iwlwifi-dkms/backport-include/linux/bug.h:3,
from
/tmp/backport-iwlwifi-dkms/backport-include/linux/kernel.h:4,
from ./include/linux/skbuff.h:13,
from
/tmp/backport-iwlwifi-dkms/backport-include/linux/skbuff.h:3,
from ./include/linux/if_ether.h:19,
from
/tmp/backport-iwlwifi-dkms/backport-include/linux/if_ether.h:3,
from ./include/linux/etherdevice.h:20,
from
/tmp/backport-iwlwifi-dkms/backport-include/linux/etherdevice.h:3,
from
/tmp/backport-iwlwifi-dkms/drivers/net/wireless/intel/iwlwifi/mei/main.c:6:
/tmp/backport-iwlwifi-dkms/drivers/net/wireless/intel/iwlwifi/mei/main.c: In
function ‘iwl_mei_free_shared_mem’:
/tmp/backport-iwlwifi-dkms/drivers/net/wireless/intel/iwlwifi/mei/main.c:243:17:
error: implicit declaration of function ‘mei_cldev_dma_unmap’
[-Werror=implicit-function-declaration]
243 | WARN_ON(mei_cldev_dma_unmap(cldev));
| ^~~~~~~~~~~~~~~~~~~
[Test case]
sudo apt install backport-iwlwifi-dkms
[Fix]
The driver assumes that kernels > 5.13 provide
mei_cldev_dma_map/unmap() when CONFIG_WLAN_VENDOR_INTEL_MEI is
defined.
However these functions and the config option are not available at all
in recent kernels.
So instead of relying on the specific kernel version simply rely on
the availability of CONFIG_WLAN_VENDOR_INTEL_MEI to determine if the
kernel has the required functions defined, or if the driver needs to
provide a custom implementation of these functions.
[Regression potential]
We may see build errors in newer kernel if
CONFIG_WLAN_VENDOR_INTEL_MEI is merged upstream and these functions
are actually provided by recent kernels.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/+bug/1951580/+subscriptions
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