add delays in pcu.c and qcu.c of ath5k when creating mesh-network on routerstation pro with ar71xx board and atheros 5213A

["kivuli" <taofeiid@gmail.com>]

Hello,
I'm trying to create mesh-network on routerstation pro with ar71xx and atheros 5213A,using openwrt backfire and ath5k.
After "iw dev wlan0 interface add mesh type mp mesh_id mymesh","ifconfig mesh up" paralyse the all network orders, I can see "ifconfig" "iwconfig" are dead with "ps",and I cannot kill them. I look up errors in "dmesg", It says the last functions is ath5k_hw_init_beacon() .I add some mdelay(1) between "ath5k_hw_reg_write(ah, 0, AR5K_TIMER0);" and "ath5k_hw_reg_write(ah, next_beacon, AR5K_TIMER0);", "ath5k_hw_reg_write(ah, timer3, AR5K_TIMER3);" and  "if (interval & AR5K_BEACON_RESET_TSF)","ath5k_hw_reg_write(ah, AR5K_ISR_BMISS, AR5K_PISR);" and "AR5K_REG_DISABLE_BITS(ah, AR5K_STA_ID1, AR5K_STA_ID1_PWR_SV);"   in it tentatively and compile it againthen tried again, and then add "mdelay(10);" between  "AR5K_QUEUE_DFS_LOCAL_IFS(queue));" and "AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),AR5K_QCU_MISC_DCU_EARLY);" in "ath5k_hw_reset_tx_queue()" in qcu.c .Finally the mesh-network is OK!
I'm not sure what is exactly wrong with ath5k,is this a bug? or did I do something wrong?
Here is the patch I used:

diff -ruN a/config.mk b/config.mk
--- a/config.mk	2010-03-17 21:42:58.000000000 +0000
+++ b/config.mk	2010-09-24 13:31:30.000000000 +0000
@@ -1,5 +1,8 @@
 export
 
+# add by zheng
+# CONFIG_ATH5K_DEBUG=y
+
 ## NOTE
 ## Make sure to have each variable declaration start
 ## in the first column, no whitespace allowed.
diff -ruN a/drivers/net/wireless/ath/ath5k/pcu.c b/drivers/net/wireless/ath/ath5k/pcu.c
--- a/drivers/net/wireless/ath/ath5k/pcu.c	2010-03-26 18:25:50.000000000 +0000
+++ b/drivers/net/wireless/ath/ath5k/pcu.c	2010-09-29 21:21:03.915143556 +0000
@@ -25,6 +25,7 @@
 \*********************************/
 
 #include <asm/unaligned.h>
+#include <linux/delay.h> 
 
 #include "ath5k.h"
 #include "reg.h"
@@ -618,11 +619,15 @@
 	    ah->ah_sc->opmode == NL80211_IFTYPE_MESH_POINT)
 		ath5k_hw_reg_write(ah, 0, AR5K_TIMER0);
 
+	mdelay(1); 
+
 	ath5k_hw_reg_write(ah, next_beacon, AR5K_TIMER0);
 	ath5k_hw_reg_write(ah, timer1, AR5K_TIMER1);
 	ath5k_hw_reg_write(ah, timer2, AR5K_TIMER2);
 	ath5k_hw_reg_write(ah, timer3, AR5K_TIMER3);
 
+	mdelay(1); 
+
 	/* Force a TSF reset if requested and enable beacons */
 	if (interval & AR5K_BEACON_RESET_TSF)
 		ath5k_hw_reset_tsf(ah);
@@ -641,6 +646,8 @@
 	else
 		ath5k_hw_reg_write(ah, AR5K_ISR_BMISS, AR5K_PISR);
 
+	mdelay(1); 
+
 	/* TODO: Set enchanced sleep registers on AR5212
 	 * based on vif->bss_conf params, until then
 	 * disable power save reporting.*/
diff -ruN a/drivers/net/wireless/ath/ath5k/qcu.c b/drivers/net/wireless/ath/ath5k/qcu.c
--- a/drivers/net/wireless/ath/ath5k/qcu.c	2010-03-26 18:25:50.000000000 +0000
+++ b/drivers/net/wireless/ath/ath5k/qcu.c	2010-09-29 21:19:04.863143555 +0000
@@ -24,6 +24,7 @@
 #include "reg.h"
 #include "debug.h"
 #include "base.h"
+#include <linux/delay.h> /* add by zheng */
 
 /*
  * Get properties for a transmit queue
@@ -331,6 +332,8 @@
 				AR5K_DCU_LCL_IFS_AIFS),
 			AR5K_QUEUE_DFS_LOCAL_IFS(queue));
 
+		mdelay(10); 
+
 		/*
 		 * Set misc registers
 		 */