If the iwlwifi firmware loading calling iwl_ucode_callback() fails to
start up the wireless driver - which will happen if CONFIG_PM is not
enabled due to a mac80211 bug - iwlwifi will incorrectly try to
release the firmware twice.
It already released the firmware and completed the firmware loading
event after copying it to the internal driver buffers, if the driver
startup fails it should not try to release it again.
The double release causes very nasty vmalloc() corruption, and results
in some rather non-obvious page faults. To make matters worse, this
happens within the context of the firmware loader callback, usually a
kworker thread - and the killing of that thread then causes further
problems, making the original issue very hard to discern.
The attached patch seems to fix it.
Linus
Attachment:
iwlwifi.patch
Description: Binary data
