linux-kernel - [PATCH 1/6] net: stmmac: return error if no DMA configuration is found

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Date:   Fri, 2 Dec 2016 15:11:45 +0100
From:   Niklas Cassel <niklas.cassel@...s.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     Niklas Cassel <niklass@...s.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/6] net: stmmac: return error if no DMA configuration is found

From: Niklas Cassel <niklas.cassel@...s.com>

All drivers except pci glue layer calls stmmac_probe_config_dt.
stmmac_probe_config_dt does a kzalloc dma_cfg.

pci glue layer does kzalloc dma_cfg explicitly, so all current
drivers does a kzalloc dma_cfg.

Return an error if no DMA configuration is found, that way
we can assume that the DMA configuration always exists.

Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1f9ec02fa7f8..04f88df7da49 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1577,16 +1577,12 @@ static void stmmac_check_ether_addr(struct stmmac_priv *priv)
  */
 static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 {
-	int pbl = DEFAULT_DMA_PBL, fixed_burst = 0, aal = 0;
-	int mixed_burst = 0;
 	int atds = 0;
 	int ret = 0;
 
-	if (priv->plat->dma_cfg) {
-		pbl = priv->plat->dma_cfg->pbl;
-		fixed_burst = priv->plat->dma_cfg->fixed_burst;
-		mixed_burst = priv->plat->dma_cfg->mixed_burst;
-		aal = priv->plat->dma_cfg->aal;
+	if (!priv->plat->dma_cfg) {
+		dev_err(priv->device, "DMA configuration not found\n");
+		return -EINVAL;
 	}
 
 	if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
@@ -1598,8 +1594,12 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 		return ret;
 	}
 
-	priv->hw->dma->init(priv->ioaddr, pbl, fixed_burst, mixed_burst,
-			    aal, priv->dma_tx_phy, priv->dma_rx_phy, atds);
+	priv->hw->dma->init(priv->ioaddr,
+			    priv->plat->dma_cfg->pbl,
+			    priv->plat->dma_cfg->fixed_burst,
+			    priv->plat->dma_cfg->mixed_burst,
+			    priv->plat->dma_cfg->aal,
+			    priv->dma_tx_phy, priv->dma_rx_phy, atds);
 
 	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
 		priv->rx_tail_addr = priv->dma_rx_phy +
-- 
2.1.4