On 23.02.2017 19:24, Thierry Reding wrote:
From: Thierry Reding <treding@xxxxxxxxxx> When DMA mapping an SKB fragment, the mapping must be checked for errors, otherwise the DMA debug code will complain upon unmap. Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 6b7a5ce19589..d7387919bdb6 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -2072,6 +2072,8 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev) des = skb_frag_dma_map(priv->device, frag, 0, skb_frag_size(frag), DMA_TO_DEVICE); + if (dma_mapping_error(priv->device, des)) + goto dma_map_err;
If this map fails, we should also unmap the previously mapped fragments and the separate mapping made using dma_map_single.
stmmac_tso_allocator(priv, des, skb_frag_size(frag), (i == nfrags - 1));
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