Patchwork [064/139] b43: Increase number of RX DMA slots

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Submitter Luis Henriques
Date Feb. 28, 2013, 2:43 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/224040/
State New
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Luis Henriques - Feb. 28, 2013, 2:43 p.m. -stable review patch.  If anyone has any objections, please let me know.


From: Larry Finger <>

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 <>
Cc: Bastian Bittorf <>
Signed-off-by: David S. Miller <>
Signed-off-by: Luis Henriques <>
 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)