brcm80211: smac: remove skb next pointer usage from the driver

In two places the next pointer was used to process a sk_buff chain
but it will always get a single sk_buff so this has been removed.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/dma.c b/drivers/net/wireless/brcm80211/brcmsmac/dma.c
index 0bb8c37..b55b1f6 100644 (file)
--- a/drivers/net/wireless/brcm80211/brcmsmac/dma.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/dma.c
@@ -1239,10 +1239,9 @@ bool dma_rxreset(struct dma_pub *pub)
  *   the error(toss frames) could be fatal and cause many subsequent hard
  *   to debug problems
  */
-int dma_txfast(struct dma_pub *pub, struct sk_buff *p0, bool commit)
+int dma_txfast(struct dma_pub *pub, struct sk_buff *p, bool commit)
 {
        struct dma_info *di = (struct dma_info *)pub;
-       struct sk_buff *p, *next;
        unsigned char *data;
        uint len;
        u16 txout;
@@ -1254,50 +1253,37 @@ int dma_txfast(struct dma_pub *pub, struct sk_buff *p0, bool commit)
        txout = di->txout;
 
        /*
-        * Walk the chain of packet buffers
-        * allocating and initializing transmit descriptor entries.
+        * obtain and initialize transmit descriptor entry.
         */
-       for (p = p0; p; p = next) {
-               data = p->data;
-               len = p->len;
-               next = p->next;
-
-               /* return nonzero if out of tx descriptors */
-               if (nexttxd(di, txout) == di->txin)
-                       goto outoftxd;
+       data = p->data;
+       len = p->len;
 
-               if (len == 0)
-                       continue;
-
-               /* get physical address of buffer start */
-               pa = pci_map_single(di->pbus, data, len, PCI_DMA_TODEVICE);
+       /* no use to transmit a zero length packet */
+       if (len == 0)
+               return 0;
 
-               flags = 0;
-               if (p == p0)
-                       flags |= D64_CTRL1_SOF;
+       /* return nonzero if out of tx descriptors */
+       if (nexttxd(di, txout) == di->txin)
+               goto outoftxd;
 
-               /* With a DMA segment list, Descriptor table is filled
-                * using the segment list instead of looping over
-                * buffers in multi-chain DMA. Therefore, EOF for SGLIST
-                * is when end of segment list is reached.
-                */
-               if (next == NULL)
-                       flags |= (D64_CTRL1_IOC | D64_CTRL1_EOF);
-               if (txout == (di->ntxd - 1))
-                       flags |= D64_CTRL1_EOT;
+       /* get physical address of buffer start */
+       pa = pci_map_single(di->pbus, data, len, PCI_DMA_TODEVICE);
 
-               dma64_dd_upd(di, di->txd64, pa, txout, &flags, len);
+       /* With a DMA segment list, Descriptor table is filled
+        * using the segment list instead of looping over
+        * buffers in multi-chain DMA. Therefore, EOF for SGLIST
+        * is when end of segment list is reached.
+        */
+       flags = D64_CTRL1_SOF | D64_CTRL1_IOC | D64_CTRL1_EOF;
+       if (txout == (di->ntxd - 1))
+               flags |= D64_CTRL1_EOT;
 
-               txout = nexttxd(di, txout);
-       }
+       dma64_dd_upd(di, di->txd64, pa, txout, &flags, len);
 
-       /* if last txd eof not set, fix it */
-       if (!(flags & D64_CTRL1_EOF))
-               di->txd64[prevtxd(di, txout)].ctrl1 =
-                    cpu_to_le32(flags | D64_CTRL1_IOC | D64_CTRL1_EOF);
+       txout = nexttxd(di, txout);
 
        /* save the packet */
-       di->txp[prevtxd(di, txout)] = p0;
+       di->txp[prevtxd(di, txout)] = p;
 
        /* bump the tx descriptor index */
        di->txout = txout;
@@ -1314,7 +1300,7 @@ int dma_txfast(struct dma_pub *pub, struct sk_buff *p0, bool commit)
 
  outoftxd:
        DMA_ERROR("%s: out of txds !!!\n", di->name);
-       brcmu_pkt_buf_free_skb(p0);
+       brcmu_pkt_buf_free_skb(p);
        di->dma.txavail = 0;
        di->dma.txnobuf++;
        return -1;

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
index 36e3e06..897e252 100644 (file)
--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
@@ -955,8 +955,6 @@ brcms_c_dotxstatus(struct brcms_c_info *wlc, struct tx_status *txs)
        brcms_c_txfifo_complete(wlc, queue, 1);
 
        if (lastframe) {
-               p->next = NULL;
-               p->prev = NULL;
                /* remove PLCP & Broadcom tx descriptor header */
                skb_pull(p, D11_PHY_HDR_LEN);
                skb_pull(p, D11_TXH_LEN);