diff options
| author |   Lars Persson <lars.persson@axis.com> | 2016-02-29 16:22:31 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-03-02 14:57:14 -0500 |
| commit | d4dc35f26e1017e2a632339ecae43706cbc06986 (patch) | |
| tree | 30f67f7dab8e59c32d42a949521972cb5a5dae6e | |
| parent | dwc_eth_qos: fix race condition in dwceqos_start_xmit (diff) | |
| download | linux-dev-d4dc35f26e1017e2a632339ecae43706cbc06986.tar.xz linux-dev-d4dc35f26e1017e2a632339ecae43706cbc06986.zip | |
dwc_eth_qos: release descriptors outside netif_tx_lock
To prepare for using the CMA, we can not be in atomic context when
de-allocating DMA buffers.
The tx lock was needed only to protect the hw reset against the xmit
handler. Now we briefly grab the tx lock while stopping the queue to
make sure no thread is inside or will enter the xmit handler.
Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/synopsys/dwc_eth_qos.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/net/ethernet/synopsys/dwc_eth_qos.c b/drivers/net/ethernet/synopsys/dwc_eth_qos.c index 926db2d58fb5..53d48c0f41bc 100644 --- a/drivers/net/ethernet/synopsys/dwc_eth_qos.c +++ b/drivers/net/ethernet/synopsys/dwc_eth_qos.c @@ -1918,15 +1918,17 @@ static int dwceqos_stop(struct net_device *ndev) phy_stop(lp->phy_dev); tasklet_disable(&lp->tx_bdreclaim_tasklet); - netif_stop_queue(ndev); napi_disable(&lp->napi); - dwceqos_drain_dma(lp); + /* Stop all tx before we drain the tx dma. */ + netif_tx_lock_bh(lp->ndev); + netif_stop_queue(ndev); + netif_tx_unlock_bh(lp->ndev); - netif_tx_lock(lp->ndev); + dwceqos_drain_dma(lp); dwceqos_reset_hw(lp); + dwceqos_descriptor_free(lp); - netif_tx_unlock(lp->ndev); return 0; } |