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net: fec: check DMA addressing limitations

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Check DMA addressing limitations as suggested by the DMA API
how-to. This does not fix a particular issue seen but is
considered good style.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Agner 2018-08-02 10:42:50 +02:00 committed by David S. Miller
parent 770b26de1e
commit 453e9dc48b
1 changed files with 8 additions and 0 deletions
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8
drivers/net/ethernet/freescale/fec_main.c
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@ -3129,6 +3129,7 @@ static int fec_enet_init(struct net_device *ndev)
unsigned dsize = fep->bufdesc_ex ? sizeof(struct bufdesc_ex) :
sizeof(struct bufdesc);
unsigned dsize_log2 = __fls(dsize);
int ret;
WARN_ON(dsize != (1 << dsize_log2));
#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
@ -3139,6 +3140,13 @@ static int fec_enet_init(struct net_device *ndev)
fep->tx_align = 0x3;
#endif
/* Check mask of the streaming and coherent API */
ret = dma_set_mask_and_coherent(&fep->pdev->dev, DMA_BIT_MASK(32));
if (ret < 0) {
dev_warn(&fep->pdev->dev, "No suitable DMA available\n");
return ret;
}
fec_enet_alloc_queue(ndev);
bd_size = (fep->total_tx_ring_size + fep->total_rx_ring_size) * dsize;