b43: Enforce DMA descriptor memory constraintsmaster-2009-11-18

Enforce all device constraints on the descriptor memory region.

There are several constraints on the descriptor memory, as documented
in the specification. The current code does not enforce them and/or
incorrectly enforces them.

Those constraints are:
- The address limitations on 30/32bit engines, that also apply to
  the skbs.
- The 4k alignment requirement on 30/32bit engines.
- The 8k alignment requirement on 64bit engines.

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

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/wireless/b43/dma.h b/drivers/net/wireless/b43/dma.h
index f0b0838fb5b..356a0ff8f04 100644
--- a/drivers/net/wireless/b43/dma.h
+++ b/drivers/net/wireless/b43/dma.h
@@ -157,7 +157,6 @@ struct b43_dmadesc_generic {
 } __attribute__ ((__packed__));
 
 /* Misc DMA constants */
-#define B43_DMA_RINGMEMSIZE		PAGE_SIZE
 #define B43_DMA0_RX_FRAMEOFFSET		30
 
 /* DMA engine tuning knobs */
@@ -243,6 +242,12 @@ struct b43_dmaring {
 	/* The QOS priority assigned to this ring. Only used for TX rings.
 	 * This is the mac80211 "queue" value. */
 	u8 queue_prio;
+	/* Pointers and size of the originally allocated and mapped memory
+	 * region for the descriptor ring. */
+	void *alloc_descbase;
+	dma_addr_t alloc_dmabase;
+	unsigned int alloc_descsize;
+	/* Pointer to our wireless device. */
 	struct b43_wldev *dev;
 #ifdef CONFIG_B43_DEBUG
 	/* Maximum number of used slots. */