diff options
| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2016-02-05 14:52:45 -0700 |
|---|---|---|
| committer | Fugang Duan <b38611@freescale.com> | 2016-02-19 18:02:04 +0800 |
| commit | 2f82c287304b6e9e765c7084498aa20d05c5cf0e (patch) | |
| tree | 4d0b57b7ba808a6921de16bcaacfaed74130602a | |
| parent | d55878688a2bb9950fd2a9186aff01c3b7fb3291 (diff) | |
net: fec: fix fec_enet_get_free_txdesc_num
When first initialized, cur_tx points to the 1st
entry in the queue, and dirty_tx points to the last.
At this point, fec_enet_get_free_txdesc_num will
return tx_ring_size -2. If tx_ring_size -2 entries
are now queued, then fec_enet_get_free_txdesc_num
should return 0, but it returns tx_ring_size instead.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/freescale/fec_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 04df423c0c94..2b1604113257 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -305,7 +305,7 @@ static int fec_enet_get_free_txdesc_num(struct fec_enet_private *fep, entries = ((const char *)txq->dirty_tx - (const char *)txq->cur_tx) / fep->bufdesc_size - 1; - return entries > 0 ? entries : entries + txq->tx_ring_size; + return entries >= 0 ? entries : entries + txq->tx_ring_size; } static void swap_buffer(void *bufaddr, int len) |