rt2x00: Re-order tx descriptor writing code in drivers.

Where possible, write the tx descriptor words from start to end, to
follow a logical ordering of words.
Where this is not possible (in rt2400pci, rt2500pci and rt61pci) add
a comment as to why word 0 needs to be written last.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 59 insertions, 44 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 4b3845152e1f..1eff6ec88457 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -1039,6 +1039,11 @@ static void rt2400pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
         rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_HIGH_BUSY, 1);
         rt2x00_desc_write(txd, 4, word);
 
+        /*
+         * Writing TXD word 0 must the last to prevent a race condition with
+         * the device, whereby the device may take hold of the TXD before we
+         * finished updating it.
+         */
         rt2x00_desc_read(txd, 0, &word);
         rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 1);
         rt2x00_set_field32(&word, TXD_W0_VALID, 1);
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index d876c6d87591..8d3e95e0dcfe 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1193,6 +1193,11 @@ static void rt2500pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                            test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags));
         rt2x00_desc_write(txd, 10, word);
 
+        /*
+         * Writing TXD word 0 must the last to prevent a race condition with
+         * the device, whereby the device may take hold of the TXD before we
+         * finished updating it.
+         */
         rt2x00_desc_read(txd, 0, &word);
         rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 1);
         rt2x00_set_field32(&word, TXD_W0_VALID, 1);
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 30c0544e8036..9a915be547b3 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1039,6 +1039,24 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
         /*
          * Start writing the descriptor words.
          */
+        rt2x00_desc_read(txd, 0, &word);
+        rt2x00_set_field32(&word, TXD_W0_RETRY_LIMIT, txdesc->retry_limit);
+        rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
+                           test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_ACK,
+                           test_bit(ENTRY_TXD_ACK, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
+                           test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_OFDM,
+                           (txdesc->rate_mode == RATE_MODE_OFDM));
+        rt2x00_set_field32(&word, TXD_W0_NEW_SEQ,
+                           test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
+        rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, txdesc->length);
+        rt2x00_set_field32(&word, TXD_W0_CIPHER, !!txdesc->cipher);
+        rt2x00_set_field32(&word, TXD_W0_KEY_ID, txdesc->key_idx);
+        rt2x00_desc_write(txd, 0, word);
+
         rt2x00_desc_read(txd, 1, &word);
         rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, txdesc->iv_offset);
         rt2x00_set_field32(&word, TXD_W1_AIFS, txdesc->aifs);
@@ -1057,24 +1075,6 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                 _rt2x00_desc_write(txd, 3, skbdesc->iv[0]);
                 _rt2x00_desc_write(txd, 4, skbdesc->iv[1]);
         }
-
-        rt2x00_desc_read(txd, 0, &word);
-        rt2x00_set_field32(&word, TXD_W0_RETRY_LIMIT, txdesc->retry_limit);
-        rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
-                           test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_ACK,
-                           test_bit(ENTRY_TXD_ACK, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
-                           test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_OFDM,
-                           (txdesc->rate_mode == RATE_MODE_OFDM));
-        rt2x00_set_field32(&word, TXD_W0_NEW_SEQ,
-                           test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
-        rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, txdesc->length);
-        rt2x00_set_field32(&word, TXD_W0_CIPHER, !!txdesc->cipher);
-        rt2x00_set_field32(&word, TXD_W0_KEY_ID, txdesc->key_idx);
-        rt2x00_desc_write(txd, 0, word);
 }
 
 /*
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index 99c298100fb6..55aa010aeee2 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -1813,6 +1813,11 @@ static void rt61pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                 rt2x00_desc_write(txd, 11, word);
         }
 
+        /*
+         * Writing TXD word 0 must the last to prevent a race condition with
+         * the device, whereby the device may take hold of the TXD before we
+         * finished updating it.
+         */
         rt2x00_desc_read(txd, 0, &word);
         rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 1);
         rt2x00_set_field32(&word, TXD_W0_VALID, 1);
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 81f6db1b16f2..fa40d434e729 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1446,6 +1446,32 @@ static void rt73usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
         /*
          * Start writing the descriptor words.
          */
+        rt2x00_desc_read(txd, 0, &word);
+        rt2x00_set_field32(&word, TXD_W0_BURST,
+                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_VALID, 1);
+        rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
+                           test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_ACK,
+                           test_bit(ENTRY_TXD_ACK, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
+                           test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_OFDM,
+                           (txdesc->rate_mode == RATE_MODE_OFDM));
+        rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
+        rt2x00_set_field32(&word, TXD_W0_RETRY_MODE,
+                           test_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_TKIP_MIC,
+                           test_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_KEY_TABLE,
+                           test_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_KEY_INDEX, txdesc->key_idx);
+        rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, txdesc->length);
+        rt2x00_set_field32(&word, TXD_W0_BURST2,
+                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
+        rt2x00_set_field32(&word, TXD_W0_CIPHER_ALG, txdesc->cipher);
+        rt2x00_desc_write(txd, 0, word);
+
         rt2x00_desc_read(txd, 1, &word);
         rt2x00_set_field32(&word, TXD_W1_HOST_Q_ID, txdesc->queue);
         rt2x00_set_field32(&word, TXD_W1_AIFSN, txdesc->aifs);
@@ -1473,32 +1499,6 @@ static void rt73usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                            TXPOWER_TO_DEV(rt2x00dev->tx_power));
         rt2x00_set_field32(&word, TXD_W5_WAITING_DMA_DONE_INT, 1);
         rt2x00_desc_write(txd, 5, word);
-
-        rt2x00_desc_read(txd, 0, &word);
-        rt2x00_set_field32(&word, TXD_W0_BURST,
-                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_VALID, 1);
-        rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
-                           test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_ACK,
-                           test_bit(ENTRY_TXD_ACK, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
-                           test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_OFDM,
-                           (txdesc->rate_mode == RATE_MODE_OFDM));
-        rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
-        rt2x00_set_field32(&word, TXD_W0_RETRY_MODE,
-                           test_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_TKIP_MIC,
-                           test_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_KEY_TABLE,
-                           test_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_KEY_INDEX, txdesc->key_idx);
-        rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, txdesc->length);
-        rt2x00_set_field32(&word, TXD_W0_BURST2,
-                           test_bit(ENTRY_TXD_BURST, &txdesc->flags));
-        rt2x00_set_field32(&word, TXD_W0_CIPHER_ALG, txdesc->cipher);
-        rt2x00_desc_write(txd, 0, word);
 }
 
 /*