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authorDavid S. Miller <davem@davemloft.net>2008-03-04 23:28:49 +0300
committerDavid S. Miller <davem@davemloft.net>2008-03-04 23:28:49 +0300
commitd9452e9f81e997cbd0c9bface8d2c2a4b064cc3e (patch)
tree6f0ea6264fa359293cc6093fff763305d4c0e9f4 /net/core/netpoll.c
parentec9b6add7d81f902f6094e71f595da4a362f3348 (diff)
downloadlinux-d9452e9f81e997cbd0c9bface8d2c2a4b064cc3e.tar.xz
[NETPOLL]: Revert two bogus cleanups that broke netconsole.
Based upon a report by Andrew Morton and code analysis done by Jarek Poplawski. This reverts 33f807ba0d9259e7c75c7a2ce8bd2787e5b540c7 ("[NETPOLL]: Kill NETPOLL_RX_DROP, set but never tested.") and c7b6ea24b43afb5749cb704e143df19d70e23dea ("[NETPOLL]: Don't need rx_flags."). The rx_flags did get tested for zero vs. non-zero and therefore we do need those tests and that code which sets NETPOLL_RX_DROP et al. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/netpoll.c')
-rw-r--r--net/core/netpoll.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 6faa128a4c8e..4b7e756181c9 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -39,6 +39,8 @@ static struct sk_buff_head skb_pool;
static atomic_t trapped;
#define USEC_PER_POLL 50
+#define NETPOLL_RX_ENABLED 1
+#define NETPOLL_RX_DROP 2
#define MAX_SKB_SIZE \
(MAX_UDP_CHUNK + sizeof(struct udphdr) + \
@@ -126,11 +128,13 @@ static int poll_one_napi(struct netpoll_info *npinfo,
if (!test_bit(NAPI_STATE_SCHED, &napi->state))
return budget;
+ npinfo->rx_flags |= NETPOLL_RX_DROP;
atomic_inc(&trapped);
work = napi->poll(napi, budget);
atomic_dec(&trapped);
+ npinfo->rx_flags &= ~NETPOLL_RX_DROP;
return budget - work;
}
@@ -472,7 +476,7 @@ int __netpoll_rx(struct sk_buff *skb)
if (skb->dev->type != ARPHRD_ETHER)
goto out;
- /* if receive ARP during middle of NAPI poll, then queue */
+ /* check if netpoll clients need ARP */
if (skb->protocol == htons(ETH_P_ARP) &&
atomic_read(&trapped)) {
skb_queue_tail(&npi->arp_tx, skb);
@@ -534,9 +538,6 @@ int __netpoll_rx(struct sk_buff *skb)
return 1;
out:
- /* If packet received while already in poll then just
- * silently drop.
- */
if (atomic_read(&trapped)) {
kfree_skb(skb);
return 1;
@@ -675,6 +676,7 @@ int netpoll_setup(struct netpoll *np)
goto release;
}
+ npinfo->rx_flags = 0;
npinfo->rx_np = NULL;
spin_lock_init(&npinfo->rx_lock);
@@ -756,6 +758,7 @@ int netpoll_setup(struct netpoll *np)
if (np->rx_hook) {
spin_lock_irqsave(&npinfo->rx_lock, flags);
+ npinfo->rx_flags |= NETPOLL_RX_ENABLED;
npinfo->rx_np = np;
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
}
@@ -797,6 +800,7 @@ void netpoll_cleanup(struct netpoll *np)
if (npinfo->rx_np == np) {
spin_lock_irqsave(&npinfo->rx_lock, flags);
npinfo->rx_np = NULL;
+ npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
}