From: Michael Buesch <mb@bu3sch.de>
Date: Thu, 19 Feb 2009 22:39:26 +0000 (+0100)
Subject: b43: Fix DMA buffer size handling
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8eccb53f1b858c9bd0b745f839174725b76508ec;p=openwrt%2Fstaging%2Fblogic.git

b43: Fix DMA buffer size handling

This fixes hidden bugs in the size handling of the DMA buffers.
This sets the RX buffer size to the theoretical max packet size and
fixes passing of the size values to the device (must not subtract the header offset).

These bugs are hidden and don't actually trigger due to the magic +100
offset for the buffer size.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index 0f021c666d08..38246046a42f 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -74,8 +74,7 @@ static void op32_fill_descriptor(struct b43_dmaring *ring,
 	addrext = (u32) (dmaaddr & SSB_DMA_TRANSLATION_MASK)
 	    >> SSB_DMA_TRANSLATION_SHIFT;
 	addr |= ssb_dma_translation(ring->dev->dev);
-	ctl = (bufsize - ring->frameoffset)
-	    & B43_DMA32_DCTL_BYTECNT;
+	ctl = bufsize & B43_DMA32_DCTL_BYTECNT;
 	if (slot == ring->nr_slots - 1)
 		ctl |= B43_DMA32_DCTL_DTABLEEND;
 	if (start)
@@ -177,8 +176,7 @@ static void op64_fill_descriptor(struct b43_dmaring *ring,
 		ctl0 |= B43_DMA64_DCTL0_FRAMEEND;
 	if (irq)
 		ctl0 |= B43_DMA64_DCTL0_IRQ;
-	ctl1 |= (bufsize - ring->frameoffset)
-	    & B43_DMA64_DCTL1_BYTECNT;
+	ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT;
 	ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT)
 	    & B43_DMA64_DCTL1_ADDREXT_MASK;
 
@@ -830,9 +828,6 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
 		if (ring->index == 0) {
 			ring->rx_buffersize = B43_DMA0_RX_BUFFERSIZE;
 			ring->frameoffset = B43_DMA0_RX_FRAMEOFFSET;
-		} else if (ring->index == 3) {
-			ring->rx_buffersize = B43_DMA3_RX_BUFFERSIZE;
-			ring->frameoffset = B43_DMA3_RX_FRAMEOFFSET;
 		} else
 			B43_WARN_ON(1);
 	}
diff --git a/drivers/net/wireless/b43/dma.h b/drivers/net/wireless/b43/dma.h
index d1eb5c0848a5..4ec24e8f4fd7 100644
--- a/drivers/net/wireless/b43/dma.h
+++ b/drivers/net/wireless/b43/dma.h
@@ -1,14 +1,12 @@
 #ifndef B43_DMA_H_
 #define B43_DMA_H_
 
-#include <linux/list.h>
+#include <linux/ieee80211.h>
 #include <linux/spinlock.h>
-#include <linux/workqueue.h>
-#include <linux/linkage.h>
-#include <asm/atomic.h>
 
 #include "b43.h"
 
+
 /* DMA-Interrupt reasons. */
 #define B43_DMAIRQ_FATALMASK	((1 << 10) | (1 << 11) | (1 << 12) \
 					 | (1 << 14) | (1 << 15))
@@ -161,14 +159,13 @@ struct b43_dmadesc_generic {
 
 /* Misc DMA constants */
 #define B43_DMA_RINGMEMSIZE		PAGE_SIZE
-#define B43_DMA0_RX_FRAMEOFFSET	30
-#define B43_DMA3_RX_FRAMEOFFSET	0
+#define B43_DMA0_RX_FRAMEOFFSET		30
 
 /* DMA engine tuning knobs */
 #define B43_TXRING_SLOTS		128
 #define B43_RXRING_SLOTS		64
-#define B43_DMA0_RX_BUFFERSIZE	(2304 + 100)
-#define B43_DMA3_RX_BUFFERSIZE	16
+#define B43_DMA0_RX_BUFFERSIZE		IEEE80211_MAX_FRAME_LEN
+
 
 struct sk_buff;
 struct b43_private;