cfg80211: fix elapsed_jiffies calculation

MAX_JIFFY_OFFSET has no meaning when calculating the
elapsed jiffies, as jiffies run out until ULONG_MAX.

This miscalculation results in erroneous values
in case of a wrap-around.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/core.h b/net/wireless/core.h
index e9afbf1..7e3a3ce 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -424,7 +424,7 @@ static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
        if (end >= start)
                return jiffies_to_msecs(end - start);
 
-       return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
+       return jiffies_to_msecs(end + (ULONG_MAX - start) + 1);
 }
 
 void