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iwlagn: simplify iwlagn_tx_skb 

We can simplify length calculation in iwlagn_tx_skb, that function
is enough complex, without fuzz it more than necessary.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2010-11-12 08:47:06 +01:00 committed by John W. Linville
parent 2cb7865648
commit 70f3876f09
1 changed files with 12 additions and 21 deletions
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33
drivers/net/wireless/iwlwifi/iwl-agn-tx.c
View File

@ -522,7 +522,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
dma_addr_t phys_addr;
dma_addr_t txcmd_phys;
dma_addr_t scratch_phys;
u16 len, len_org, firstlen, secondlen;
u16 len, firstlen, secondlen;
u16 seq_number = 0;
__le16 fc;
u8 hdr_len;
@ -687,30 +687,23 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
*/
len = sizeof(struct iwl_tx_cmd) +
sizeof(struct iwl_cmd_header) + hdr_len;
len_org = len;
firstlen = len = (len + 3) & ~3;
if (len_org != len)
len_org = 1;
else
len_org = 0;
firstlen = (len + 3) & ~3;
/* Tell NIC about any 2-byte padding after MAC header */
if (len_org)
if (firstlen != len)
tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
/* Physical address of this Tx command's header (not MAC header!),
* within command buffer array. */
txcmd_phys = pci_map_single(priv->pci_dev,
&out_cmd->hdr, len,
&out_cmd->hdr, firstlen,
PCI_DMA_BIDIRECTIONAL);
dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
dma_unmap_len_set(out_meta, len, len);
dma_unmap_len_set(out_meta, len, firstlen);
/* Add buffer containing Tx command and MAC(!) header to TFD's
* first entry */
priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
txcmd_phys, len, 1, 0);
txcmd_phys, firstlen, 1, 0);
if (!ieee80211_has_morefrags(hdr->frame_control)) {
txq->need_update = 1;
@ -721,23 +714,21 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
/* Set up TFD's 2nd entry to point directly to remainder of skb,
* if any (802.11 null frames have no payload). */
secondlen = len = skb->len - hdr_len;
if (len) {
secondlen = skb->len - hdr_len;
if (secondlen > 0) {
phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
len, PCI_DMA_TODEVICE);
secondlen, PCI_DMA_TODEVICE);
priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
phys_addr, len,
phys_addr, secondlen,
0, 0);
}
scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
offsetof(struct iwl_tx_cmd, scratch);
len = sizeof(struct iwl_tx_cmd) +
sizeof(struct iwl_cmd_header) + hdr_len;
/* take back ownership of DMA buffer to enable update */
pci_dma_sync_single_for_cpu(priv->pci_dev, txcmd_phys,
len, PCI_DMA_BIDIRECTIONAL);
firstlen, PCI_DMA_BIDIRECTIONAL);
tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
@ -753,7 +744,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
le16_to_cpu(tx_cmd->len));
pci_dma_sync_single_for_device(priv->pci_dev, txcmd_phys,
len, PCI_DMA_BIDIRECTIONAL);
firstlen, PCI_DMA_BIDIRECTIONAL);
trace_iwlwifi_dev_tx(priv,
&((struct iwl_tfd *)txq->tfds)[txq->q.write_ptr],