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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-13 10:52:27 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-13 10:52:27 -0700
commite030dbf91a87da7e8be3be3ca781558695bea683 (patch)
tree4ff2e01621a888be4098ca48c404775e56a55a0d /net/ipv4
parent12a22960549979c10a95cc97f8ec63b461c55692 (diff)
parent3039f0735a280b54c7364fbfe6a9287f7f0b510a (diff)
downloadop-kernel-dev-e030dbf91a87da7e8be3be3ca781558695bea683.zip
op-kernel-dev-e030dbf91a87da7e8be3be3ca781558695bea683.tar.gz
Merge branch 'ioat-md-accel-for-linus' of git://lost.foo-projects.org/~dwillia2/git/iop
* 'ioat-md-accel-for-linus' of git://lost.foo-projects.org/~dwillia2/git/iop: (28 commits) ioatdma: add the unisys "i/oat" pci vendor/device id ARM: Add drivers/dma to arch/arm/Kconfig iop3xx: surface the iop3xx DMA and AAU units to the iop-adma driver iop13xx: surface the iop13xx adma units to the iop-adma driver dmaengine: driver for the iop32x, iop33x, and iop13xx raid engines md: remove raid5 compute_block and compute_parity5 md: handle_stripe5 - request io processing in raid5_run_ops md: handle_stripe5 - add request/completion logic for async expand ops md: handle_stripe5 - add request/completion logic for async read ops md: handle_stripe5 - add request/completion logic for async check ops md: handle_stripe5 - add request/completion logic for async compute ops md: handle_stripe5 - add request/completion logic for async write ops md: common infrastructure for running operations with raid5_run_ops md: raid5_run_ops - run stripe operations outside sh->lock raid5: replace custom debug PRINTKs with standard pr_debug raid5: refactor handle_stripe5 and handle_stripe6 (v3) async_tx: add the async_tx api xor: make 'xor_blocks' a library routine for use with async_tx dmaengine: make clients responsible for managing channels dmaengine: refactor dmaengine around dma_async_tx_descriptor ...
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 450f44b..987b944 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1116,6 +1116,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
long timeo;
struct task_struct *user_recv = NULL;
int copied_early = 0;
+ struct sk_buff *skb;
lock_sock(sk);
@@ -1142,16 +1143,26 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
#ifdef CONFIG_NET_DMA
tp->ucopy.dma_chan = NULL;
preempt_disable();
- if ((len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) &&
- !sysctl_tcp_low_latency && __get_cpu_var(softnet_data).net_dma) {
- preempt_enable_no_resched();
- tp->ucopy.pinned_list = dma_pin_iovec_pages(msg->msg_iov, len);
- } else
- preempt_enable_no_resched();
+ skb = skb_peek_tail(&sk->sk_receive_queue);
+ {
+ int available = 0;
+
+ if (skb)
+ available = TCP_SKB_CB(skb)->seq + skb->len - (*seq);
+ if ((available < target) &&
+ (len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) &&
+ !sysctl_tcp_low_latency &&
+ __get_cpu_var(softnet_data).net_dma) {
+ preempt_enable_no_resched();
+ tp->ucopy.pinned_list =
+ dma_pin_iovec_pages(msg->msg_iov, len);
+ } else {
+ preempt_enable_no_resched();
+ }
+ }
#endif
do {
- struct sk_buff *skb;
u32 offset;
/* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */
@@ -1439,7 +1450,6 @@ skip_copy:
#ifdef CONFIG_NET_DMA
if (tp->ucopy.dma_chan) {
- struct sk_buff *skb;
dma_cookie_t done, used;
dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
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