linux-kernel - [ 15/86] b43: Increase number of RX DMA slots

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Date:	Tue, 26 Feb 2013 16:07:23 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Larry Finger <Larry.Finger@...inger.net>,
	Bastian Bittorf <bittorf@...ebottle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 15/86] b43: Increase number of RX DMA slots

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Larry Finger <Larry.Finger@...inger.net>

commit ccae0e50c16a7f7adb029c169147400d1ce9f703 upstream.

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/b43/dma.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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)

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