On Mon, Feb 27, 2017 at 11:37:24AM +0200, Mikko Perttunen wrote: > 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. That's already taken care of via the dma_map_err label: dev_kfree_skb() consume_skb() __kfree_skb() skb_release_all() skb_release_data() Thierry
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