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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>
This commit is contained in:
Arend van Spriel 2011-11-22 17:21:37 -08:00 committed by John W. Linville
parent 0b45bf74f9
commit 3030794fca
2 changed files with 24 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/net/wireless/brcm80211/brcmsmac/dma.c
View File

@ -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;
data = p->data;
len = p->len;
/* return nonzero if out of tx descriptors */
if (nexttxd(di, txout) == di->txin)
goto outoftxd;
/* no use to transmit a zero length packet */
if (len == 0)
return 0;
if (len == 0)
continue;
/* return nonzero if out of tx descriptors */
if (nexttxd(di, txout) == di->txin)
goto outoftxd;
/* get physical address of buffer start */
pa = pci_map_single(di->pbus, data, len, PCI_DMA_TODEVICE);
/* get physical address of buffer start */
pa = pci_map_single(di->pbus, data, len, PCI_DMA_TODEVICE);
flags = 0;
if (p == p0)
flags |= D64_CTRL1_SOF;
/* 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;
/* 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;
dma64_dd_upd(di, di->txd64, pa, txout, &flags, len);
dma64_dd_upd(di, di->txd64, pa, txout, &flags, len);
txout = nexttxd(di, txout);
}
/* 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;

2
drivers/net/wireless/brcm80211/brcmsmac/main.c
View File

@ -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);