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authorAmerigo Wang <amwang@redhat.com>2012-08-24 21:41:11 +0000
committerDavid S. Miller <davem@davemloft.net>2012-08-29 15:03:23 -0400
commit072a9c48600409d72aeb0d5b29fbb75861a06631 (patch)
tree76c214a5f7830085559150f0168b5d3ef1dcbd44
parentf88cf73d80cca0c56bb35168cc857d1c78c8c0b9 (diff)
downloadlinux-072a9c48600409d72aeb0d5b29fbb75861a06631.tar.bz2
netpoll: revert 6bdb7fe3104 and fix be_poll() instead
Against -net. In the patch "netpoll: re-enable irq in poll_napi()", I tried to fix the following warning: [100718.051041] ------------[ cut here ]------------ [100718.051048] WARNING: at kernel/softirq.c:159 local_bh_enable_ip+0x7d/0xb0() (Not tainted) [100718.051049] Hardware name: ProLiant BL460c G7 ... [100718.051068] Call Trace: [100718.051073] [<ffffffff8106b747>] ? warn_slowpath_common+0x87/0xc0 [100718.051075] [<ffffffff8106b79a>] ? warn_slowpath_null+0x1a/0x20 [100718.051077] [<ffffffff810747ed>] ? local_bh_enable_ip+0x7d/0xb0 [100718.051080] [<ffffffff8150041b>] ? _spin_unlock_bh+0x1b/0x20 [100718.051085] [<ffffffffa00ee974>] ? be_process_mcc+0x74/0x230 [be2net] [100718.051088] [<ffffffffa00ea68c>] ? be_poll_tx_mcc+0x16c/0x290 [be2net] [100718.051090] [<ffffffff8144fe76>] ? netpoll_poll_dev+0xd6/0x490 [100718.051095] [<ffffffffa01d24a5>] ? bond_poll_controller+0x75/0x80 [bonding] [100718.051097] [<ffffffff8144fde5>] ? netpoll_poll_dev+0x45/0x490 [100718.051100] [<ffffffff81161b19>] ? ksize+0x19/0x80 [100718.051102] [<ffffffff81450437>] ? netpoll_send_skb_on_dev+0x157/0x240 by reenabling IRQ before calling ->poll, but it seems more problems are introduced after that patch: http://ozlabs.org/~akpm/stuff/IMG_20120824_122054.jpg http://marc.info/?l=linux-netdev&m=134563282530588&w=2 So it is safe to fix be2net driver code directly. This patch reverts the offending commit and fixes be_poll() by avoid disabling BH there, this is okay because be_poll() can be called either by poll_napi() which already disables IRQ, or by net_rx_action() which already disables BH. Reported-by: Andrew Morton <akpm@linux-foundation.org> Reported-by: Sylvain Munaut <s.munaut@whatever-company.com> Cc: Sylvain Munaut <s.munaut@whatever-company.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Miller <davem@davemloft.net> Cc: Sathya Perla <sathya.perla@emulex.com> Cc: Subbu Seetharaman <subbu.seetharaman@emulex.com> Cc: Ajit Khaparde <ajit.khaparde@emulex.com> Signed-off-by: Cong Wang <amwang@redhat.com> Tested-by: Sylvain Munaut <s.munaut@whatever-company.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/emulex/benet/be_cmds.c6
-rw-r--r--drivers/net/ethernet/emulex/benet/be_main.c2
-rw-r--r--net/core/netpoll.c10
3 files changed, 7 insertions, 11 deletions
diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.c b/drivers/net/ethernet/emulex/benet/be_cmds.c
index 7fac97b4bb59..8c63d06ab12b 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.c
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.c
@@ -259,7 +259,7 @@ int be_process_mcc(struct be_adapter *adapter)
int num = 0, status = 0;
struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
- spin_lock_bh(&adapter->mcc_cq_lock);
+ spin_lock(&adapter->mcc_cq_lock);
while ((compl = be_mcc_compl_get(adapter))) {
if (compl->flags & CQE_FLAGS_ASYNC_MASK) {
/* Interpret flags as an async trailer */
@@ -280,7 +280,7 @@ int be_process_mcc(struct be_adapter *adapter)
if (num)
be_cq_notify(adapter, mcc_obj->cq.id, mcc_obj->rearm_cq, num);
- spin_unlock_bh(&adapter->mcc_cq_lock);
+ spin_unlock(&adapter->mcc_cq_lock);
return status;
}
@@ -295,7 +295,9 @@ static int be_mcc_wait_compl(struct be_adapter *adapter)
if (be_error(adapter))
return -EIO;
+ local_bh_disable();
status = be_process_mcc(adapter);
+ local_bh_enable();
if (atomic_read(&mcc_obj->q.used) == 0)
break;
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 90a903d83d87..78b8aa8069f0 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -3763,7 +3763,9 @@ static void be_worker(struct work_struct *work)
/* when interrupts are not yet enabled, just reap any pending
* mcc completions */
if (!netif_running(adapter->netdev)) {
+ local_bh_disable();
be_process_mcc(adapter);
+ local_bh_enable();
goto reschedule;
}
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 346b1eb83a1f..e4ba3e70c174 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -168,24 +168,16 @@ static void poll_napi(struct net_device *dev)
struct napi_struct *napi;
int budget = 16;
- WARN_ON_ONCE(!irqs_disabled());
-
list_for_each_entry(napi, &dev->napi_list, dev_list) {
- local_irq_enable();
if (napi->poll_owner != smp_processor_id() &&
spin_trylock(&napi->poll_lock)) {
- rcu_read_lock_bh();
budget = poll_one_napi(rcu_dereference_bh(dev->npinfo),
napi, budget);
- rcu_read_unlock_bh();
spin_unlock(&napi->poll_lock);
- if (!budget) {
- local_irq_disable();
+ if (!budget)
break;
- }
}
- local_irq_disable();
}
}