net: stmmac: return error if no DMA configuration is found

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@axis.com>
Acked-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 982c952..1436680 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1578,16 +1578,12 @@ 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))
@@ -1599,8 +1595,12 @@ 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 +