Public bug reported:
[ Impact ]
Upstream stable update v5.15.170 [1] for jammy introduces a backport of
upstream commit [2]
56440d7ec28d genetlink: hold RCU in genlmsg_mcast()
which drops the @flags parameter from function
genlmsg_multicast_allns(). The backport-iwlwifi module does not use its
compat implementation of that function when building against 5.15 but
links against what the kernel is providing. The build will consequently
fail with:
<<DKMSDIR>>/build/backport-iwlwifi/11510/build/net/wireless/nl80211.c: In
function 'nl80211_common_reg_change_event':
<<DKMSDIR>>/build/backport-iwlwifi/11510/build/net/wireless/nl80211.c:17769:9:
error: too many arguments to function 'genlmsg_multicast_allns'
17769 | genlmsg_multicast_allns(&nl80211_fam, msg, 0,
| ^~~~~~~~~~~~~~~~~~~~~~~
In file included from
<<DKMSDIR>>/build/backport-iwlwifi/11510/build/backport-include/net/genetlink.h:3,
from
<<DKMSDIR>>/build/backport-iwlwifi/11510/build/net/wireless/nl80211.c:25:
./include/net/genetlink.h:342:5: note: declared here
342 | int genlmsg_multicast_allns(const struct genl_family *family,
| ^~~~~~~~~~~~~~~~~~~~~~~
In order to build against the kernel with the modified function
signature of genlmsg_multicast_allns() we need to patch
net/wireless/nl80211.c that is shipped with backport-iwlwifi and drop
the now superfluous @flag parameter.
[ Test Plan ]
This issue can be reproduced by trying to build the dkms package against
a 5.15 kernel, e.g. jammy linux, with stable update v5.15.170 applied.
[ Where problems could occur ]
If at some point the compat implementation of the affected functionality
were to be used instead of what the kernel provides, the mismatch
between the calls in net/wireless/nl80211.c and the compat version of
genlmsg_multicast_allns() would cause the build to break again.
[ Other Info ]
[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2089272
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=56440d7ec28d60f8da3bfa09062b3368ff9b16db
** Affects: backport-iwlwifi-dkms (Ubuntu)
Importance: Undecided
Status: New
** Affects: backport-iwlwifi-dkms (Ubuntu Jammy)
Importance: High
Assignee: Manuel Diewald (diewald)
Status: In Progress
** Also affects: backport-iwlwifi-dkms (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: backport-iwlwifi-dkms (Ubuntu Jammy)
Assignee: (unassigned) => Manuel Diewald (diewald)
** Changed in: backport-iwlwifi-dkms (Ubuntu Jammy)
Importance: Undecided => High
** Changed in: backport-iwlwifi-dkms (Ubuntu Jammy)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2089385
Title:
Fails to build against linux-5.15 after stable update
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