From: Robin Murphy <robin.murphy@arm.com>
To: Stefan Agner <stefan@agner.ch>, fugang.duan@nxp.com, davem@davemloft.net
Cc: krzk@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] net: fec: check DMA addressing limitations
Date: Thu, 2 Aug 2018 10:19:20 +0100 [thread overview]
Message-ID: <e03a908e-4c0d-a295-90a7-2da11c8fead5@arm.com> (raw)
In-Reply-To: <20180802084250.26489-1-stefan@agner.ch>
On 2018-08-02 9:42 AM, Stefan Agner wrote:
> 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.
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> ---
> drivers/net/ethernet/freescale/fec_main.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index c729665107f5..cdf2f5447910 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -3136,6 +3136,7 @@ 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)
> @@ -3146,6 +3147,13 @@ 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;
>
next prev parent reply other threads:[~2018-08-02 9:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-02 8:42 [PATCH v2] net: fec: check DMA addressing limitations Stefan Agner
2018-08-02 9:14 ` Andy Duan
2018-08-02 9:19 ` Robin Murphy [this message]
2018-08-02 17:28 ` David Miller
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