wireless: implement basic rate helper function

This adds a helper function that, given a bitmap of basic
rates and a bitrate returns the response rate for this rate.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/net/wireless/util.c b/net/wireless/util.c
index f54424693a38..e76cc28b0345 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -7,6 +7,25 @@
 #include <asm/bitops.h>
 #include "core.h"
 
+struct ieee80211_rate *
+ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
+                            u64 basic_rates, int bitrate)
+{
+        struct ieee80211_rate *result = &sband->bitrates[0];
+        int i;
+
+        for (i = 0; i < sband->n_bitrates; i++) {
+                if (!(basic_rates & BIT(i)))
+                        continue;
+                if (sband->bitrates[i].bitrate > bitrate)
+                        continue;
+                result = &sband->bitrates[i];
+        }
+
+        return result;
+}
+EXPORT_SYMBOL(ieee80211_get_response_rate);
+
 int ieee80211_channel_to_frequency(int chan)
 {
         if (chan < 14)