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Subject[34-longterm 036/196] b43: allocate receive buffers big enough for max frame len + offset
Date
From: "John W. Linville" <linville@tuxdriver.com>

-------------------
This is a commit scheduled for the next v2.6.34 longterm release.
If you see a problem with using this for longterm, please comment.
-------------------

commit c85ce65ecac078ab1a1835c87c4a6319cf74660a upstream.

Otherwise, skb_put inside of dma_rx can fail...

https://bugzilla.kernel.org/show_bug.cgi?id=32042

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
drivers/net/wireless/b43/dma.c | 2 +-
drivers/net/wireless/b43/dma.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index fa40fdf..b8900f0 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -1538,7 +1538,7 @@ static void dma_rx(struct b43_dmaring *ring, int *slot)
dmaaddr = meta->dmaaddr;
goto drop_recycle_buffer;
}
- if (unlikely(len > ring->rx_buffersize)) {
+ if (unlikely(len + ring->frameoffset > ring->rx_buffersize)) {
/* The data did not fit into one descriptor buffer
* and is split over multiple buffers.
* This should never happen, as we try to allocate buffers
diff --git a/drivers/net/wireless/b43/dma.h b/drivers/net/wireless/b43/dma.h
index dc91944..a9282d7 100644
--- a/drivers/net/wireless/b43/dma.h
+++ b/drivers/net/wireless/b43/dma.h
@@ -163,7 +163,7 @@ struct b43_dmadesc_generic {
/* DMA engine tuning knobs */
#define B43_TXRING_SLOTS 256
#define B43_RXRING_SLOTS 64
-#define B43_DMA0_RX_BUFFERSIZE IEEE80211_MAX_FRAME_LEN
+#define B43_DMA0_RX_BUFFERSIZE (B43_DMA0_RX_FRAMEOFFSET + IEEE80211_MAX_FRAME_LEN)

/* Pointer poison */
#define B43_DMA_PTR_POISON ((void *)ERR_PTR(-ENOMEM))
--
1.7.9.3


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