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Date: Wed, 04 Nov 2015 00:55:13 +0300
From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To: netdev@...r.kernel.org
Cc: linux-sh@...r.kernel.org
Subject: [PATCH] sh_eth: merge sh_eth_free_dma_buffer() into sh_eth_ring_free()
While the ring allocation is done by a single function, sh_eth_ring_init(),
the ring deallocation was split into two functions (almost always called
one after the other) for no good reason. Merge sh_eth_free_dma_buffer()
into sh_eth_ring_free() which allows us to save space not only on the
direct calls of the former function but also on the sh_eth_ring_init()'s
simplified error path...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
---
The patch is against DaveM's 'net-next.git' repo plus the patch just posted.
drivers/net/ethernet/renesas/sh_eth.c | 60 ++++++++++++----------------------
1 file changed, 22 insertions(+), 38 deletions(-)
Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -1098,7 +1098,7 @@ static struct mdiobb_ops bb_ops = {
static void sh_eth_ring_free(struct net_device *ndev)
{
struct sh_eth_private *mdp = netdev_priv(ndev);
- int i;
+ int ringsize, i;
/* Free Rx skb ringbuffer */
if (mdp->rx_skbuff) {
@@ -1115,6 +1115,20 @@ static void sh_eth_ring_free(struct net_
}
kfree(mdp->tx_skbuff);
mdp->tx_skbuff = NULL;
+
+ if (mdp->rx_ring) {
+ ringsize = sizeof(struct sh_eth_rxdesc) * mdp->num_rx_ring;
+ dma_free_coherent(NULL, ringsize, mdp->rx_ring,
+ mdp->rx_desc_dma);
+ mdp->rx_ring = NULL;
+ }
+
+ if (mdp->tx_ring) {
+ ringsize = sizeof(struct sh_eth_txdesc) * mdp->num_tx_ring;
+ dma_free_coherent(NULL, ringsize, mdp->tx_ring,
+ mdp->tx_desc_dma);
+ mdp->tx_ring = NULL;
+ }
}
/* format skb and descriptor buffer */
@@ -1220,14 +1234,14 @@ static int sh_eth_ring_init(struct net_d
mdp->tx_skbuff = kcalloc(mdp->num_tx_ring, sizeof(*mdp->tx_skbuff),
GFP_KERNEL);
if (!mdp->tx_skbuff)
- goto skb_ring_free;
+ goto ring_free;
/* Allocate all Rx descriptors. */
rx_ringsize = sizeof(struct sh_eth_rxdesc) * mdp->num_rx_ring;
mdp->rx_ring = dma_alloc_coherent(NULL, rx_ringsize, &mdp->rx_desc_dma,
GFP_KERNEL);
if (!mdp->rx_ring)
- goto skb_ring_free;
+ goto ring_free;
mdp->dirty_rx = 0;
@@ -1236,41 +1250,16 @@ static int sh_eth_ring_init(struct net_d
mdp->tx_ring = dma_alloc_coherent(NULL, tx_ringsize, &mdp->tx_desc_dma,
GFP_KERNEL);
if (!mdp->tx_ring)
- goto desc_ring_free;
+ goto ring_free;
return 0;
-desc_ring_free:
- /* free DMA buffer */
- dma_free_coherent(NULL, rx_ringsize, mdp->rx_ring, mdp->rx_desc_dma);
-
-skb_ring_free:
- /* Free Rx and Tx skb ring buffer */
+ring_free:
+ /* Free Rx and Tx skb ring buffer and DMA buffer */
sh_eth_ring_free(ndev);
- mdp->tx_ring = NULL;
- mdp->rx_ring = NULL;
return -ENOMEM;
}
-static void sh_eth_free_dma_buffer(struct sh_eth_private *mdp)
-{
- int ringsize;
-
- if (mdp->rx_ring) {
- ringsize = sizeof(struct sh_eth_rxdesc) * mdp->num_rx_ring;
- dma_free_coherent(NULL, ringsize, mdp->rx_ring,
- mdp->rx_desc_dma);
- mdp->rx_ring = NULL;
- }
-
- if (mdp->tx_ring) {
- ringsize = sizeof(struct sh_eth_txdesc) * mdp->num_tx_ring;
- dma_free_coherent(NULL, ringsize, mdp->tx_ring,
- mdp->tx_desc_dma);
- mdp->tx_ring = NULL;
- }
-}
-
static int sh_eth_dev_init(struct net_device *ndev, bool start)
{
int ret = 0;
@@ -2231,10 +2220,8 @@ static int sh_eth_set_ringparam(struct n
sh_eth_dev_exit(ndev);
- /* Free all the skbuffs in the Rx queue. */
+ /* Free all the skbuffs in the Rx queue and the DMA buffers. */
sh_eth_ring_free(ndev);
- /* Free DMA buffer */
- sh_eth_free_dma_buffer(mdp);
}
/* Set new parameters */
@@ -2479,12 +2466,9 @@ static int sh_eth_close(struct net_devic
free_irq(ndev->irq, ndev);
- /* Free all the skbuffs in the Rx queue. */
+ /* Free all the skbuffs in the Rx queue and the DMA buffer. */
sh_eth_ring_free(ndev);
- /* free DMA buffer */
- sh_eth_free_dma_buffer(mdp);
-
pm_runtime_put_sync(&mdp->pdev->dev);
mdp->is_opened = 0;
--
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