mac80211: Do not scan for IBSS merge with a fixed BSSID.

Currently, when we are on an IBSS network with no active station,
we would scan for other BSSID, even if fixed_bssid is on,  due to
a bug in ibss.c,  where fixed_channel would be checked instead of
fixed_bssid.  This would trigger useless scans where scan results
would not be used anyway.

This patch also reverts commit 39d02a7d90602d4557ee05db2a157a4e0,
which assumed that the ifibss->fixed_channel check was legitimate
to disable single-channel scans.  IBSS single-channel scan should
now be fixed.

Signed-off-by: Nicolas Cavallari <cavallar@lri.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Revert "mac80211: Do not scan for IBSS merge with a fixed BSSID."

This reverts commit f1e3be1561c43b6bbe2426e34849fb1486dc313b.

Johannes Berg <johannes@sipsolutions.net> thinks that this patch is
incorrect.  I'll defer to his judgment.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
mac80211: fix ibss scanning

commit 34bcf71502413f8903ade93746f2d0f04b937a78 upstream.

Do not scan on no-IBSS and disabled channels in IBSS mode. Doing this
can trigger Microcode errors on iwlwifi and iwlegacy drivers.

Also rename ieee80211_request_internal_scan() function since it is only
used in IBSS mode and simplify calling it from ieee80211_sta_find_ibss().

This patch should address:
https://bugzilla.redhat.com/show_bug.cgi?id=883414
https://bugzilla.kernel.org/show_bug.cgi?id=49411

Reported-by: Jesse Kahtava <jesse_kahtava@f-m.fm>
Reported-by: Mikko Rapeli  <mikko.rapeli@iki.fi>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cfg80211: fix scan crash on single-band cards

commit 58389c69150e6032504dfcd3edca6b1975c8b5bc
Author: Johannes Berg <johannes.berg@intel.com>
Date:   Mon Jul 18 18:08:35 2011 +0200

     cfg80211: allow userspace to control supported rates in scan

made single-band cards crash since it would always
access all wiphy->bands[]. Fix this and reject any
attempts in the new helper ieee80211_get_ratemask()
to do the same, rejecting rates configuration for
unsupported bands.

Reported-by: Pavel Roskin <proski@gnu.org>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
leanKernel v2.7.3