1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index 0a70149df3f..98a574a4a46 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -866,6 +866,14 @@ static int fill_ctrlset(struct zd_mac *mac,
 
         ZD_ASSERT(frag_len <= 0xffff);
 
+        /*
+         * Firmware computes the duration itself (for all frames except PSPoll)
+         * and needs the field set to 0 at input, otherwise firmware messes up
+         * duration_id and sets bits 14 and 15 on.
+         */
+        if (!ieee80211_is_pspoll(hdr->frame_control))
+                hdr->duration_id = 0;
+
         txrate = ieee80211_get_tx_rate(mac->hw, info);
 
         cs->modulation = txrate->hw_value;