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3c59x: fix another page map/single unmap imbalance

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libdma debug found another page map/unmap imbalance in 3c59x.  Multi fragment
frames are mapped such that the lead fragment was mapped as a single entry,
while all other fragments were mapped as pages.  However, on unmapping they were
all unmapped as pages.  Fix is pretty easy, just unmap the lead frag as a single
entry, and bump the for loop initalization up by one so that all subsequent
frags get unmapped as pages

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: Steffen Klassert <klassert@mathematik.tu-chemnitz.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2016-01-13 12:43:54 -05:00 committed by David S. Miller
parent 7356f4e424
commit 6e144419e4
1 changed files with 6 additions and 1 deletions
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7
drivers/net/ethernet/3com/3c59x.c
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@ -2459,7 +2459,12 @@ boomerang_interrupt(int irq, void *dev_id)
struct sk_buff *skb = vp->tx_skbuff[entry];
#if DO_ZEROCOPY
int i;
for (i=0; i<=skb_shinfo(skb)->nr_frags; i++)
pci_unmap_single(VORTEX_PCI(vp),
le32_to_cpu(vp->tx_ring[entry].frag[0].addr),
le32_to_cpu(vp->tx_ring[entry].frag[0].length),
PCI_DMA_TODEVICE);
for (i=1; i<=skb_shinfo(skb)->nr_frags; i++)
pci_unmap_page(VORTEX_PCI(vp),
le32_to_cpu(vp->tx_ring[entry].frag[i].addr),
le32_to_cpu(vp->tx_ring[entry].frag[i].length)&0xFFF,