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b43: Increase number of RX DMA slots

commit ccae0e5 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: Greg Kroah-Hartman <>
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1 parent abf9870 commit 936f8ea980bdfa57f7e55e49e020e74547329e01 @lwfinger lwfinger committed with gregkh Feb 17, 2013
Showing with 1 addition and 1 deletion.
  1. +1 −1 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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