mwifiex: fix command timeout problem seen in stress tests

It is observed that if single tid 6 packet comes among with massive tid 0
packets, tid 6 packet may stay in it's queue and will never be
transmited. This is because wmm.highest_queued_prio will be set to 2
during transmission of tid 0 packets As a result, main work thread
keeps on looping without serving that packet. In this case, if command
has downloaded to firmware, driver doesn't process it's response causing
command timeout.

This patch will reset highest_queued_prio if packets exist in data
queue, and try to find a ra_list for current private.
Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/main.h

@@ -315,6 +315,7 @@ struct mwifiex_tid_tbl {
 #define WMM_HIGHEST_PRIORITY		7
 #define HIGH_PRIO_TID				7
 #define LOW_PRIO_TID				0
+#define NO_PKT_PRIO_TID				-1
 #define MWIFIEX_WMM_DRV_DELAY_MAX 510
 
 struct mwifiex_wmm_desc {

drivers/net/wireless/marvell/mwifiex/wmm.c

@@ -1105,6 +1105,7 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 				    &adapter->bss_prio_tbl[j].bss_prio_head,
 				    list) {
 
+try_again:
 			priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 
 			if (((priv_tmp->bss_mode != NL80211_IFTYPE_ADHOC) &&
@@ -1140,8 +1141,18 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 						       ra_list_spinlock,
 						       flags_ra);
 			}
-		}
 
+			if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) != 0) {
+				atomic_set(&priv_tmp->wmm.highest_queued_prio,
+					   HIGH_PRIO_TID);
+				/* Iterate current private once more, since
+				 * there still exist packets in data queue
+				 */
+				goto try_again;
+			} else
+				atomic_set(&priv_tmp->wmm.highest_queued_prio,
+					   NO_PKT_PRIO_TID);
+		}
 	}
 
 	return NULL;