rt2x00: Avoid unnecessary uncached
Reading the TX desciptor words from coherent memory is always uncached
and potentially slow. Hence, don't read the TX descriptor prior to
writing it since we update all fields anyway.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index 17abb06..a716d1d 100644
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -619,11 +619,11 @@
/*
* Initialize TX descriptor
*/
- rt2x00_desc_read(txd, 0, &word);
+ word = 0;
rt2x00_set_field32(&word, TXD_W0_SD_PTR0, skbdesc->skb_dma);
rt2x00_desc_write(txd, 0, word);
- rt2x00_desc_read(txd, 1, &word);
+ word = 0;
rt2x00_set_field32(&word, TXD_W1_SD_LEN1, entry->skb->len);
rt2x00_set_field32(&word, TXD_W1_LAST_SEC1,
!test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
@@ -634,12 +634,12 @@
rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 0);
rt2x00_desc_write(txd, 1, word);
- rt2x00_desc_read(txd, 2, &word);
+ word = 0;
rt2x00_set_field32(&word, TXD_W2_SD_PTR1,
skbdesc->skb_dma + TXWI_DESC_SIZE);
rt2x00_desc_write(txd, 2, word);
- rt2x00_desc_read(txd, 3, &word);
+ word = 0;
rt2x00_set_field32(&word, TXD_W3_WIV,
!test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags));
rt2x00_set_field32(&word, TXD_W3_QSEL, 2);