staging: et131x: Remove unnecessary DMA address alignment code

"The cpu return address and the DMA bus master address are both
guaranteed to be aligned to the smallest PAGE_SIZE order which
is greater than or equal to the requested size."

There are several places in the et131x.c code where these addresses are
aligned to a 4k boundary after a call to dma_alloc_coherent(),
needlessly.

Remove these alignment offset calculations, and the
et131x_align_allocated_memory() call which is only used for 4k
alignments.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index 4f68646..5f15a2e 100644 (file)
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -290,7 +290,6 @@ struct fbr_lookup {
        dma_addr_t       ring_physaddr;
        void            *mem_virtaddrs[MAX_DESC_PER_RING_RX / FBR_CHUNKS];
        dma_addr_t       mem_physaddrs[MAX_DESC_PER_RING_RX / FBR_CHUNKS];
-       dma_addr_t       offset;
        u32              local_full;
        u32              num_entries;
        dma_addr_t       buffsize;
@@ -2227,32 +2226,6 @@ static inline u32 bump_free_buff_ring(u32 *free_buff_ring, u32 limit)
 }
 
 /**
- * et131x_align_allocated_memory - Align allocated memory on a given boundary
- * @adapter: pointer to our adapter structure
- * @phys_addr: pointer to Physical address
- * @offset: pointer to the offset variable
- * @mask: correct mask
- */
-static void et131x_align_allocated_memory(struct et131x_adapter *adapter,
-                                         dma_addr_t *phys_addr,
-                                         dma_addr_t *offset,
-                                         u64 mask)
-{
-       u64 new_addr = *phys_addr & ~mask;
-
-       *offset = 0;
-
-       if (new_addr != *phys_addr) {
-               /* Move to next aligned block */
-               new_addr += mask + 1;
-               /* Return offset for adjusting virt addr */
-               *offset = new_addr - *phys_addr;
-               /* Return new physical address */
-               *phys_addr = new_addr;
-       }
-}
-
-/**
  * et131x_rx_dma_memory_alloc
  * @adapter: pointer to our private adapter structure
  *
@@ -2268,7 +2241,6 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
        u32 bufsize;
        u32 pktstat_ringsize;
        u32 fbr_chunksize;
-       u32 fbr_align;
        struct rx_ring *rx_ring;
 
        /* Setup some convenience pointers */
@@ -2331,29 +2303,13 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
                           "Cannot alloc memory for Free Buffer Ring %d\n", id);
                        return -ENOMEM;
                }
-
-               /* Align Free Buffer Ring on a 4K boundary */
-               et131x_align_allocated_memory(adapter,
-                                            &rx_ring->fbr[id]->ring_physaddr,
-                                            &rx_ring->fbr[id]->offset, 0x0FFF);
-
-               rx_ring->fbr[id]->ring_virtaddr =
-                       (void *)((u8 *) rx_ring->fbr[id]->ring_virtaddr +
-                       rx_ring->fbr[id]->offset);
        }
 
        for (id = 0; id < NUM_FBRS; id++) {
-               if (id == 0 && rx_ring->fbr[id]->buffsize > 4096)
-                               fbr_align = 4096;
-               else
-                               fbr_align = rx_ring->fbr[id]->buffsize;
-
-               fbr_chunksize = (FBR_CHUNKS *
-                                rx_ring->fbr[id]->buffsize) + fbr_align - 1;
+               fbr_chunksize = (FBR_CHUNKS * rx_ring->fbr[id]->buffsize);
 
                for (i = 0; i < (rx_ring->fbr[id]->num_entries / FBR_CHUNKS); i++) {
                        dma_addr_t fbr_tmp_physaddr;
-                       dma_addr_t fbr_offset;
 
                        /* This code allocates an area of memory big enough for
                         * N free buffers + (buffer_size - 1) so that the
@@ -2376,11 +2332,6 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
                        /* See NOTE in "Save Physical Address" comment above */
                        fbr_tmp_physaddr = rx_ring->fbr[id]->mem_physaddrs[i];
 
-                       et131x_align_allocated_memory(adapter,
-                                                     &fbr_tmp_physaddr,
-                                                     &fbr_offset,
-                                                     (fbr_align - 1));
-
                        for (j = 0; j < FBR_CHUNKS; j++) {
                                u32 index = (i * FBR_CHUNKS) + j;
 
@@ -2389,7 +2340,7 @@ static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
                                 */
                                rx_ring->fbr[id]->virt[index] =
                                  (u8 *) rx_ring->fbr[id]->mem_virtaddrs[i] +
-                                 (j * rx_ring->fbr[id]->buffsize) + fbr_offset;
+                                 (j * rx_ring->fbr[id]->buffsize);
 
                                /* now store the physical address in the
                                 * descriptor so the device can access it
@@ -2499,16 +2450,8 @@ static void et131x_rx_dma_memory_free(struct et131x_adapter *adapter)
                                (rx_ring->fbr[id]->num_entries / FBR_CHUNKS);
                             index++) {
                                if (rx_ring->fbr[id]->mem_virtaddrs[index]) {
-                                       u32 fbr_align;
 
-                                       if (rx_ring->fbr[id]->buffsize > 4096)
-                                               fbr_align = 4096;
-                                       else
-                                               fbr_align = rx_ring->fbr[id]->buffsize;
-
-                                       bufsize =
-                                           (rx_ring->fbr[id]->buffsize * FBR_CHUNKS) +
-                                           fbr_align - 1;
+                                       bufsize = (rx_ring->fbr[id]->buffsize * FBR_CHUNKS);
 
                                        dma_free_coherent(&adapter->pdev->dev,
                                                bufsize,
@@ -2519,10 +2462,6 @@ static void et131x_rx_dma_memory_free(struct et131x_adapter *adapter)
                                }
                        }
 
-                       /* Now the FIFO itself */
-                       rx_ring->fbr[id]->ring_virtaddr = (void *)((u8 *)
-                           rx_ring->fbr[id]->ring_virtaddr - rx_ring->fbr[id]->offset);
-
                        bufsize =
                            (sizeof(struct fbr_desc) * rx_ring->fbr[id]->num_entries) +
                                                                                0xfff;
@@ -2967,7 +2906,7 @@ static int et131x_tx_dma_memory_alloc(struct et131x_adapter *adapter)
        /* Allocate enough memory for the Tx descriptor ring, and allocate
         * some extra so that the ring can be aligned on a 4k boundary.
         */
-       desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX) + 4096 - 1;
+       desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX);
        tx_ring->tx_desc_ring =
            (struct tx_desc *) dma_alloc_coherent(&adapter->pdev->dev,
                                                  desc_size,
@@ -3011,8 +2950,7 @@ static void et131x_tx_dma_memory_free(struct et131x_adapter *adapter)
 
        if (adapter->tx_ring.tx_desc_ring) {
                /* Free memory relating to Tx rings here */
-               desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX)
-                                                               + 4096 - 1;
+               desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX);
                dma_free_coherent(&adapter->pdev->dev,
                                    desc_size,
                                    adapter->tx_ring.tx_desc_ring,