mwifiex: process RX packets in SDIO IRQ thread directly

ksdioirqd has higher priority than kworker. Process RX packets
in SDIO IRQ thread (ksdioirqd/mmcX) directly instead of deferring
the work to kworker to avoid the extra latency.
This improves TCP throughput 15~20% on an ARM platform with SDIO
2.0 controller.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c
index 1afcd404a10..9c802ede9c3 100644
--- a/drivers/net/wireless/mwifiex/main.c
+++ b/drivers/net/wireless/mwifiex/main.c
@@ -282,6 +282,7 @@ exit_main_proc:
                 mwifiex_shutdown_drv(adapter);
         return ret;
 }
+EXPORT_SYMBOL_GPL(mwifiex_main_process);
 
 /*
  * This function frees the adapter structure.
diff --git a/drivers/net/wireless/mwifiex/sdio.c b/drivers/net/wireless/mwifiex/sdio.c
index 0d67333daa2..4fbbd611f63 100644
--- a/drivers/net/wireless/mwifiex/sdio.c
+++ b/drivers/net/wireless/mwifiex/sdio.c
@@ -905,8 +905,8 @@ static void mwifiex_interrupt_status(struct mwifiex_adapter *adapter)
 /*
  * SDIO interrupt handler.
  *
- * This function reads the interrupt status from firmware and assigns
- * the main process in workqueue which will handle the interrupt.
+ * This function reads the interrupt status from firmware and handles
+ * the interrupt in current thread (ksdioirqd) right away.
  */
 static void
 mwifiex_sdio_interrupt(struct sdio_func *func)
@@ -929,7 +929,7 @@ mwifiex_sdio_interrupt(struct sdio_func *func)
                 adapter->ps_state = PS_STATE_AWAKE;
 
         mwifiex_interrupt_status(adapter);
-        queue_work(adapter->workqueue, &adapter->main_work);
+        mwifiex_main_process(adapter);
 }
 
 /*