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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>
This commit is contained in:
Troy Kisky 2016-02-05 14:52:45 -07:00 committed by David S. Miller
parent 095098e194
commit 93c595f7b8
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/freescale/fec_main.c
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@ -296,7 +296,7 @@ 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)