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path: root/drivers/net/wireless/mwl8k.c
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Diffstat (limited to 'drivers/net/wireless/mwl8k.c')
-rw-r--r--drivers/net/wireless/mwl8k.c83
1 files changed, 13 insertions, 70 deletions
diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 301d2a20d42..5aa80420c0d 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -111,17 +111,6 @@ struct mwl8k_rx_queue {
struct sk_buff **rx_skb;
};
-struct mwl8k_skb {
- /*
- * The DMA engine requires a modification to the payload.
- * If the skbuff is shared/cloned, it needs to be unshared.
- * This method is used to ensure the stack always gets back
- * the skbuff it sent for transmission.
- */
- struct sk_buff *clone;
- struct sk_buff *skb;
-};
-
struct mwl8k_tx_queue {
/* hw transmits here */
int tx_head;
@@ -132,7 +121,7 @@ struct mwl8k_tx_queue {
struct ieee80211_tx_queue_stats tx_stats;
struct mwl8k_tx_desc *tx_desc_area;
dma_addr_t tx_desc_dma;
- struct mwl8k_skb *tx_skb;
+ struct sk_buff **tx_skb;
};
/* Pointers to the firmware data and meta information about it. */
@@ -714,12 +703,11 @@ struct mwl8k_dma_data {
} __attribute__((packed));
/* Routines to add/remove DMA header from skb. */
-static inline int mwl8k_remove_dma_header(struct sk_buff *skb)
+static inline void mwl8k_remove_dma_header(struct sk_buff *skb)
{
- struct mwl8k_dma_data *tr = (struct mwl8k_dma_data *)(skb->data);
+ struct mwl8k_dma_data *tr = (struct mwl8k_dma_data *)skb->data;
void *dst, *src = &tr->wh;
- __le16 fc = tr->wh.frame_control;
- int hdrlen = ieee80211_hdrlen(fc);
+ int hdrlen = ieee80211_hdrlen(tr->wh.frame_control);
u16 space = sizeof(struct mwl8k_dma_data) - hdrlen;
dst = (void *)tr + space;
@@ -727,11 +715,9 @@ static inline int mwl8k_remove_dma_header(struct sk_buff *skb)
memmove(dst, src, hdrlen);
skb_pull(skb, space);
}
-
- return 0;
}
-static inline struct sk_buff *mwl8k_add_dma_header(struct sk_buff *skb)
+static inline void mwl8k_add_dma_header(struct sk_buff *skb)
{
struct ieee80211_hdr *wh;
u32 hdrlen, pktlen;
@@ -763,8 +749,6 @@ static inline struct sk_buff *mwl8k_add_dma_header(struct sk_buff *skb)
* This includes all crypto material including the MIC.
*/
tr->fwlen = cpu_to_le16(pktlen - hdrlen);
-
- return skb;
}
@@ -967,10 +951,7 @@ static int rxq_process(struct ieee80211_hw *hw, int index, int limit)
MWL8K_RX_MAXSZ, PCI_DMA_FROMDEVICE);
skb_put(skb, le16_to_cpu(rx_desc->pkt_len));
- if (mwl8k_remove_dma_header(skb)) {
- dev_kfree_skb(skb);
- continue;
- }
+ mwl8k_remove_dma_header(skb);
wh = (struct ieee80211_hdr *)skb->data;
@@ -1224,7 +1205,6 @@ static void mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int force)
while (txq->tx_stats.len > 0) {
int tx;
- int rc;
struct mwl8k_tx_desc *tx_desc;
unsigned long addr;
int size;
@@ -1232,7 +1212,6 @@ static void mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int force)
struct ieee80211_tx_info *info;
u32 status;
- rc = 0;
tx = txq->tx_head;
tx_desc = txq->tx_desc_area + tx;
@@ -1252,40 +1231,18 @@ static void mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int force)
addr = le32_to_cpu(tx_desc->pkt_phys_addr);
size = le16_to_cpu(tx_desc->pkt_len);
- skb = txq->tx_skb[tx].skb;
- txq->tx_skb[tx].skb = NULL;
+ skb = txq->tx_skb[tx];
+ txq->tx_skb[tx] = NULL;
BUG_ON(skb == NULL);
pci_unmap_single(priv->pdev, addr, size, PCI_DMA_TODEVICE);
- rc = mwl8k_remove_dma_header(skb);
+ mwl8k_remove_dma_header(skb);
/* Mark descriptor as unused */
tx_desc->pkt_phys_addr = 0;
tx_desc->pkt_len = 0;
- if (txq->tx_skb[tx].clone) {
- /* Replace with original skb
- * before returning to stack
- * as buffer has been cloned
- */
- dev_kfree_skb(skb);
- skb = txq->tx_skb[tx].clone;
- txq->tx_skb[tx].clone = NULL;
- }
-
- if (rc) {
- /* Something has gone wrong here.
- * Failed to remove DMA header.
- * Print error message and drop packet.
- */
- printk(KERN_ERR "%s: Error removing DMA header from "
- "tx skb 0x%p.\n", priv->name, skb);
-
- dev_kfree_skb(skb);
- continue;
- }
-
info = IEEE80211_SKB_CB(skb);
ieee80211_tx_info_clear_status(info);
if (MWL8K_TXD_SUCCESS(status))
@@ -1327,7 +1284,6 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
struct mwl8k_tx_desc *tx;
struct mwl8k_dma_data *tr;
struct mwl8k_vif *mwl8k_vif;
- struct sk_buff *org_skb = skb;
dma_addr_t dma;
u16 qos = 0;
bool qosframe = false, ampduframe = false;
@@ -1338,21 +1294,12 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
txq = priv->txq + index;
tx = txq->tx_desc_area + txq->tx_tail;
- BUG_ON(txq->tx_skb[txq->tx_tail].skb != NULL);
+ BUG_ON(txq->tx_skb[txq->tx_tail] != NULL);
/*
- * Append HW DMA header to start of packet. Drop packet if
- * there is not enough space or a failure to unshare/unclone
- * the skb.
+ * Append HW DMA header to start of packet.
*/
- skb = mwl8k_add_dma_header(skb);
-
- if (skb == NULL) {
- printk(KERN_DEBUG "%s: failed to prepend HW DMA "
- "header, dropping TX frame.\n", priv->name);
- dev_kfree_skb(org_skb);
- return NETDEV_TX_OK;
- }
+ mwl8k_add_dma_header(skb);
tx_info = IEEE80211_SKB_CB(skb);
mwl8k_vif = MWL8K_VIF(tx_info->control.vif);
@@ -1380,8 +1327,6 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
printk(KERN_DEBUG "%s: failed to dma map skb, "
"dropping TX frame.\n", priv->name);
- if (org_skb != NULL)
- dev_kfree_skb(org_skb);
if (skb != NULL)
dev_kfree_skb(skb);
return NETDEV_TX_OK;
@@ -1437,9 +1382,7 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
tx->pkt_phys_addr = cpu_to_le32(dma);
tx->pkt_len = cpu_to_le16(skb->len);
- txq->tx_skb[txq->tx_tail].skb = skb;
- txq->tx_skb[txq->tx_tail].clone =
- skb == org_skb ? NULL : org_skb;
+ txq->tx_skb[txq->tx_tail] = skb;
spin_lock_bh(&priv->tx_lock);
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-30 23:24:02 +0000