netdev - [PATCH] b43: Increase number of RX DMA slots

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Message-Id: <1361156480-32566-1-git-send-email-Larry.Finger@lwfinger.net>
Date:	Sun, 17 Feb 2013 21:01:20 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	linville@...driver.com
Cc:	linux-wireless@...r.kernel.org,
	Larry Finger <Larry.Finger@...inger.net>,
	netdev@...r.kernel.org, Bastian Bittorf <bittorf@...ebottle.com>,
	Stable <stable@...r.kernel.org>
Subject: [PATCH] b43: Increase number of RX DMA slots

Bastian Bittorf reported that some of the silent freezes on a Linksys WRT54G
were due to overflow of the RX DMA ring buffer, which was created with 64
slots. That finding reminded me that I was seeing similar crashed on a netbook,
which also has a relatively slow processor. After increasing the number of
slots to 128, runs on the netbook that previously failed now worked; however,
I found that 109 slots had been used in one test. For that reason, the number
of slots is being increased to 256.

Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Cc: Bastian Bittorf <bittorf@...ebottle.com>
Cc: Stable <stable@...r.kernel.org>
---
---
 drivers/net/wireless/b43/dma.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/b43/dma.h b/drivers/net/wireless/b43/dma.h
index 315b96e..9fdd198 100644
--- a/drivers/net/wireless/b43/dma.h
+++ b/drivers/net/wireless/b43/dma.h
@@ -169,7 +169,7 @@ struct b43_dmadesc_generic {
 
 /* DMA engine tuning knobs */
 #define B43_TXRING_SLOTS		256
-#define B43_RXRING_SLOTS		64
+#define B43_RXRING_SLOTS		256
 #define B43_DMA0_RX_FW598_BUFSIZE	(B43_DMA0_RX_FW598_FO + IEEE80211_MAX_FRAME_LEN)
 #define B43_DMA0_RX_FW351_BUFSIZE	(B43_DMA0_RX_FW351_FO + IEEE80211_MAX_FRAME_LEN)
 
-- 
1.8.1.1

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