Based on a suggestion by Matthew Garrett, please try the patch below.
Thanks,
Larry
=================
Index: wireless-testing/drivers/net/wireless/b43/main.c
===================================================================
--- wireless-testing.orig/drivers/net/wireless/b43/main.c
+++ wireless-testing/drivers/net/wireless/b43/main.c
@@ -43,6 +43,7 @@
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <asm/unaligned.h>
+#include <linux/pm_qos_params.h>
#include "b43.h"
#include "main.h"
@@ -3881,6 +3882,8 @@ redo:
if (!dev || b43_status(dev) < B43_STAT_STARTED)
return dev;
+ pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY, "b43",
+ PM_QOS_DEFAULT_VALUE);
/* Cancel work. Unlock to avoid deadlocks. */
mutex_unlock(&wl->mutex);
cancel_delayed_work_sync(&dev->periodic_work);
@@ -3963,6 +3966,9 @@ static int b43_wireless_core_start(struc
/* We are ready to run. */
b43_set_status(dev, B43_STAT_STARTED);
+ /* Set the maximum DMA latency */
+ pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY, "b43", 200);
+
/* Start data flow (TX/RX). */
b43_mac_enable(dev);
b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, dev->irq_mask);
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