Over time, a whole bunch of drivers have come up
with their own scheme to delay the configure_filter
operation to a workqueue. To be able to simplify
things, allow configure_filter to sleep, and add
a new prepare_multicast callback that drivers that
need the multicast address list implement. This new
callback must be atomic, but most drivers either
don't care or just calculate a hash which can be
done atomically and then uploaded to the hardware
non-atomically.

A cursory look suggests that at76c50x-usb, ar9170,
mwl8k (which is actually very broken now), rt2x00,
wl1251, wl1271 and zd1211 should make use of this
new capability.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This patch fixes the following errors:

driver-trace.h:148:1: error: cannot size expression
driver-trace.h:148:1: error: cannot size expression
[...]
driver-trace.h:222:1: error: cannot size expression
driver-trace.h:71:1: error: incompatible types for operation (<)
driver-trace.h:71:1:    left side has type void *<noident>
driver-trace.h:71:1:    right side has type int
driver-trace.h:99:1: error: incompatible types for operation (<)
driver-trace.h:99:1:    left side has type void *<noident>
driver-trace.h:99:1:    right side has type int
driver-trace.h:148:1: error: incompatible types for operation (<)
driver-trace.h:148:1:    left side has type void *<noident>
driver-trace.h:148:1:    right side has type int
driver-trace.h:222:1: error: cannot size expression
driver-trace.h:248:1: error: incompatible types for operation (<)
driver-trace.h:248:1:    left side has type void *<noident>
driver-trace.h:248:1:    right side has type int
driver-trace.h:446:1: error: incompatible types for operation (<)
driver-trace.h:446:1:    left side has type void *<noident>
driver-trace.h:446:1:    right side has type int
Signed-off-by: NChristian Lamparter <chunkeey@web.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

This makes mac80211 use the event tracing framework
to log all operations as given to the driver. This
will need to be extended with more information, but
as a start it should be good.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>