3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me 
know.

------------------

From: Arik Nemtsov <[email protected]>

commit 254d3dfe445f94a764e399ca12e04365ac9413ed upstream.

In TDLS channel-switch operations the chandef can sometimes be NULL.
Avoid an oops in the trace code for these cases and just print a
chandef full of zeros.

Fixes: a7a6bdd0670fe ("mac80211: introduce TDLS channel switch ops")
Signed-off-by: Arik Nemtsov <[email protected]>
Signed-off-by: Emmanuel Grumbach <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Luis Henriques <[email protected]>
---
 net/mac80211/trace.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h
index cfe1a0688b5c..569332bdb10f 100644
--- a/net/mac80211/trace.h
+++ b/net/mac80211/trace.h
@@ -32,11 +32,11 @@
                        __field(u32, chan_width)                                
        \
                        __field(u32, center_freq1)                              
        \
                        __field(u32, center_freq2)
-#define CHANDEF_ASSIGN(c)                                                      
        \
-                       __entry->control_freq = (c)->chan ? 
(c)->chan->center_freq : 0; \
-                       __entry->chan_width = (c)->width;                       
        \
-                       __entry->center_freq1 = (c)->center_freq1;              
        \
-                       __entry->center_freq2 = (c)->center_freq2;
+#define CHANDEF_ASSIGN(c)                                                      
\
+                       __entry->control_freq = (c) ? ((c)->chan ? 
(c)->chan->center_freq : 0) : 0;     \
+                       __entry->chan_width = (c) ? (c)->width : 0;             
        \
+                       __entry->center_freq1 = (c) ? (c)->center_freq1 : 0;    
        \
+                       __entry->center_freq2 = (c) ? (c)->center_freq2 : 0;
 #define CHANDEF_PR_FMT " control:%d MHz width:%d center: %d/%d MHz"
 #define CHANDEF_PR_ARG __entry->control_freq, __entry->chan_width,             
        \
                        __entry->center_freq1, __entry->center_freq2
--
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