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authorMaciej W. Rozycki <macro@linux-mips.org>2014-07-05 15:14:30 +0100
committerDavid S. Miller <davem@davemloft.net>2014-07-08 15:30:11 -0700
commit6329fe5c4e61655bcb8456805d2c485f791b50cc (patch)
tree5243eb413f7807356969eb4ed844f6e330aace5d /drivers/net/fddi
parentd68ab591f874cf752101ac77b08c01123b6f3a2e (diff)
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defxx: Discard DMA maps on buffer deallocation
Prearranged receive DMA bounce buffer mappings are not released in the card reboot/shutdown path. That does not affect frame reception, but probably explains the random segmentation fault I observed the other day on interface shutdown. Card is rebooted as required by the spec in the process of ring fault recovery when a PC Trace signal has been received. This change fixes the problem in an obvious manner. Reported-by: Robert Coerver <Robert.Coerver@ll.mit.edu> Tested-by: Robert Coerver <Robert.Coerver@ll.mit.edu> Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/fddi')
-rw-r--r--drivers/net/fddi/defxx.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/fddi/defxx.c b/drivers/net/fddi/defxx.c
index 4dcfb32983d9..0b2e80940b95 100644
--- a/drivers/net/fddi/defxx.c
+++ b/drivers/net/fddi/defxx.c
@@ -3447,8 +3447,13 @@ static void dfx_rcv_flush( DFX_board_t *bp )
{
struct sk_buff *skb;
skb = (struct sk_buff *)bp->p_rcv_buff_va[i+j];
- if (skb)
+ if (skb) {
+ dma_unmap_single(bp->bus_dev,
+ bp->descr_block_virt->rcv_data[i+j].long_1,
+ PI_RCV_DATA_K_SIZE_MAX,
+ DMA_FROM_DEVICE);
dev_kfree_skb(skb);
+ }
bp->p_rcv_buff_va[i+j] = NULL;
}