system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-11-05 18:23:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

b43: Fix DMA buffer size handling

Browse source 
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>
This commit is contained in:
Michael Buesch 2009-02-19 23:39:26 +01:00 committed by John W. Linville
parent ca2d559e1a
commit 8eccb53f1b
2 changed files with 7 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/net/wireless/b43/dma.c
View file

@ -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);
}

13
drivers/net/wireless/b43/dma.h
View file

@ -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;