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

Greg Kroah-Hartman
2013-02-27T00:08:48Z

From: Larry Finger <Larry.Finger@lwfinger.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@lwfinger.net>
Cc: Bastian Bittorf <bittorf@bluebottle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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)