ssb: Fix usage of struct device used for DMAing

This fixes DMA on architectures where DMA is nontrivial, like PPC64.
We must use the host-device's (PCI) struct device for any DMA
operation instead of the SSB device. For this we add a new
struct device pointer to the SSB device structure that will always
point to the right device for DMAing.

Without this patch b43 and b44 drivers won't work on complex-DMA
architectures, that for example need dev->archdata for DMA operations.

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

1 files changed, 14 insertions, 13 deletions

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index 948eb1fe916b..48e912487b16 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -373,10 +373,10 @@ static inline
         dma_addr_t dmaaddr;
 
         if (tx) {
-                dmaaddr = dma_map_single(ring->dev->dev->dev,
+                dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
                                          buf, len, DMA_TO_DEVICE);
         } else {
-                dmaaddr = dma_map_single(ring->dev->dev->dev,
+                dmaaddr = dma_map_single(ring->dev->dev->dma_dev,
                                          buf, len, DMA_FROM_DEVICE);
         }
 
@@ -388,9 +388,10 @@ static inline
                           dma_addr_t addr, size_t len, int tx)
 {
         if (tx) {
-                dma_unmap_single(ring->dev->dev->dev, addr, len, DMA_TO_DEVICE);
+                dma_unmap_single(ring->dev->dev->dma_dev,
+                                 addr, len, DMA_TO_DEVICE);
         } else {
-                dma_unmap_single(ring->dev->dev->dev,
+                dma_unmap_single(ring->dev->dev->dma_dev,
                                  addr, len, DMA_FROM_DEVICE);
         }
 }
@@ -400,7 +401,7 @@ static inline
                                  dma_addr_t addr, size_t len)
 {
         B43_WARN_ON(ring->tx);
-        dma_sync_single_for_cpu(ring->dev->dev->dev,
+        dma_sync_single_for_cpu(ring->dev->dev->dma_dev,
                                 addr, len, DMA_FROM_DEVICE);
 }
 
@@ -409,7 +410,7 @@ static inline
                                     dma_addr_t addr, size_t len)
 {
         B43_WARN_ON(ring->tx);
-        dma_sync_single_for_device(ring->dev->dev->dev,
+        dma_sync_single_for_device(ring->dev->dev->dma_dev,
                                    addr, len, DMA_FROM_DEVICE);
 }
 
@@ -425,7 +426,7 @@ static inline
 
 static int alloc_ringmemory(struct b43_dmaring *ring)
 {
-        struct device *dev = ring->dev->dev->dev;
+        struct device *dma_dev = ring->dev->dev->dma_dev;
         gfp_t flags = GFP_KERNEL;
 
         /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K
@@ -439,7 +440,7 @@ static int alloc_ringmemory(struct b43_dmaring *ring)
          */
         if (ring->type == B43_DMA_64BIT)
                 flags |= GFP_DMA;
-        ring->descbase = dma_alloc_coherent(dev, B43_DMA_RINGMEMSIZE,
+        ring->descbase = dma_alloc_coherent(dma_dev, B43_DMA_RINGMEMSIZE,
                                             &(ring->dmabase), flags);
         if (!ring->descbase) {
                 b43err(ring->dev->wl, "DMA ringmemory allocation failed\n");
@@ -452,9 +453,9 @@ static int alloc_ringmemory(struct b43_dmaring *ring)
 
 static void free_ringmemory(struct b43_dmaring *ring)
 {
-        struct device *dev = ring->dev->dev->dev;
+        struct device *dma_dev = ring->dev->dev->dma_dev;
 
-        dma_free_coherent(dev, B43_DMA_RINGMEMSIZE,
+        dma_free_coherent(dma_dev, B43_DMA_RINGMEMSIZE,
                           ring->descbase, ring->dmabase);
 }
 
@@ -854,7 +855,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
                         goto err_kfree_meta;
 
                 /* test for ability to dma to txhdr_cache */
-                dma_test = dma_map_single(dev->dev->dev,
+                dma_test = dma_map_single(dev->dev->dma_dev,
                                           ring->txhdr_cache,
                                           b43_txhdr_size(dev),
                                           DMA_TO_DEVICE);
@@ -869,7 +870,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
                         if (!ring->txhdr_cache)
                                 goto err_kfree_meta;
 
-                        dma_test = dma_map_single(dev->dev->dev,
+                        dma_test = dma_map_single(dev->dev->dma_dev,
                                                   ring->txhdr_cache,
                                                   b43_txhdr_size(dev),
                                                   DMA_TO_DEVICE);
@@ -883,7 +884,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
                         }
                 }
 
-                dma_unmap_single(dev->dev->dev,
+                dma_unmap_single(dev->dev->dma_dev,
                                  dma_test, b43_txhdr_size(dev),
                                  DMA_TO_DEVICE);
         }