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tun: fix tun_chr_aio_write so that aio works

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aio_write gets const struct iovec * but tun_chr_aio_write casts this to struct
iovec * and modifies the iovec. As a result, attempts to use io_submit
to send packets to a tun device fail with weird errors such as EINVAL.

Since tun is the only user of skb_copy_datagram_from_iovec, we can
fix this simply by changing the later so that it does not
touch the iovec passed to it.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin
2009-04-20 01:26:11 +00:00
committed by David S. Miller
parent 43b39dcdbd
commit 6f26c9a755
5 changed files with 30 additions and 17 deletions
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3
include/linux/skbuff.h
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@@ -1715,7 +1715,8 @@ extern int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb,
struct iovec *iov);
extern int skb_copy_datagram_from_iovec(struct sk_buff *skb,
int offset,
struct iovec *from,
const struct iovec *from,
int from_offset,
int len);
extern int skb_copy_datagram_const_iovec(const struct sk_buff *from,
int offset,