[PATCH v2] ibmveth: Use dma_alloc_coherent() instead of kmalloc/dma_map_single()
From: Cai Huoqing <hidden>
Date: 2021-09-26 06:52:30
Replacing kmalloc/kfree/dma_map_single/dma_unmap_single() with dma_alloc_coherent/dma_free_coherent() helps to reduce code size, and simplify the code, and coherent DMA will not clear the cache every time. Signed-off-by: Cai Huoqing <redacted> --- v1->v2: Remove extra change in Kconfig drivers/net/ethernet/ibm/ibmveth.c | 25 +++++++++---------------- 1 file changed, 9 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 3d9b4f99d357..3aedb680adb8 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c@@ -605,17 +605,13 @@ static int ibmveth_open(struct net_device *netdev) } rc = -ENOMEM; - adapter->bounce_buffer = - kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL); - if (!adapter->bounce_buffer) - goto out_free_irq; - adapter->bounce_buffer_dma = - dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer, - netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL); - if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) { - netdev_err(netdev, "unable to map bounce buffer\n"); - goto out_free_bounce_buffer; + adapter->bounce_buffer = dma_alloc_coherent(&adapter->vdev->dev, + netdev->mtu + IBMVETH_BUFF_OH, + &adapter->bounce_buffer_dma, GFP_KERNEL); + if (!adapter->bounce_buffer) { + netdev_err(netdev, "unable to alloc bounce buffer\n"); + goto out_free_irq; } netdev_dbg(netdev, "initial replenish cycle\n");
@@ -627,8 +623,6 @@ static int ibmveth_open(struct net_device *netdev) return 0; -out_free_bounce_buffer: - kfree(adapter->bounce_buffer); out_free_irq: free_irq(netdev->irq, netdev); out_free_buffer_pools:
@@ -702,10 +696,9 @@ static int ibmveth_close(struct net_device *netdev) ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[i]); - dma_unmap_single(&adapter->vdev->dev, adapter->bounce_buffer_dma, - adapter->netdev->mtu + IBMVETH_BUFF_OH, - DMA_BIDIRECTIONAL); - kfree(adapter->bounce_buffer); + dma_free_coherent(&adapter->vdev->dev, + adapter->netdev->mtu + IBMVETH_BUFF_OH, + adapter->bounce_buffer, adapter->bounce_buffer_dma); netdev_dbg(netdev, "close complete\n");
--
2.25.1