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[PATCH v2] mwifiex: process RX packets in SDIO IRQ thread directly

From: Bing Zhao <hidden>
Date: 2012-11-06 00:59:24
Subsystem: networking drivers (wireless), the rest · Maintainers: Johannes Berg, Linus Torvalds

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 <redacted>
---
v2: modify the comment to accompany the change
    (Mukesh Agrawal [off-list ref])

 drivers/net/wireless/mwifiex/main.c |    1 +
 drivers/net/wireless/mwifiex/sdio.c |    6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c
index 1df767b..51a13f8 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 fc8a9bf..011c816 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);
 }
 
 /*
-- 
1.7.0.2
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