CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2019/05/10 10:44:36
Modified files:
sys/dev/ic : bwireg.h
sys/dev/pci : if_bwi_pci.c
Log message:
Explicitly disable BCM4331 chips present in 2011-2012 Apple Mac systems.
The Mac EFI firmware enables the wireless controller, but does not disable it,
so it continues to receive packets and signal interrupts. This
was originally seen as an interrupt storm that consumes about 50% of
CPU0 on affected machines. The issue was originally discovered in 2012 by
Matthew Garret with a partial fix in Grub, then Lukas Wunner added a fix for
the Linux kernel in 2016.
This piggy-backs on the most-related driver (bwi) for the purpose of detection
and mapping the control registers, but does not actually register the driver if
the affected chip is detected.
See this archived discussion for further analysis of the bug:
https://www.mail-archive.com/[email protected]/msg1165355.html
ok kettenis stsp
