From: Arend van Spriel <arend@broadcom.com>
Date: Mon, 19 Nov 2012 11:01:05 +0000 (+0100)
Subject: mac80211: check add_chanctx callback before use in ieee80211_reconfig
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~45^2~17^2^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0dea9c73a16caac6b46886eb08f51dd82894ca4;p=pandora-kernel.git

mac80211: check add_chanctx callback before use in ieee80211_reconfig

During testing our mac80211 driver a fatal error occurred which was
signalled to mac80211. Upon performing the reconfiguration of the
device a WARN_ON was triggered. This warning checked the return value
of drv_add_chanctx(). However, this returns -EOPNOTSUPP when the
driver does not provide the callback. As the callback is optional
better check it is defined before calling drv_add_chanctx().

Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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