diff options
| author | Chris Leech <christopher.leech@intel.com> | 2006-08-03 01:21:19 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-08-03 01:21:19 +0400 |
| commit | e6eb307d48c81d688804f8b39a0a3ddde3cd3458 (patch) | |
| tree | d60117a38c614f916defbb91eda0b9e38feeb8ec /net | |
| parent | 9bbf28a1ff7b9d4e7df57829c25638721984277b (diff) | |
| download | linux-e6eb307d48c81d688804f8b39a0a3ddde3cd3458.tar.xz | |
[I/OAT]: Remove CPU hotplug lock from net_dma_rebalance
Remove the lock_cpu_hotplug()/unlock_cpu_hotplug() calls from
net_dma_rebalance
The lock_cpu_hotplug()/unlock_cpu_hotplug() sequence in
net_dma_rebalance is both incorrect (as pointed out by David Miller)
because lock_cpu_hotplug() may sleep while the net_dma_event_lock
spinlock is held, and unnecessary (as pointed out by Andrew Morton) as
spin_lock() disables preemption which protects from CPU hotplug
events.
Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 5b630cece707..f25d7ecaf035 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3419,12 +3419,9 @@ static void net_dma_rebalance(void) unsigned int cpu, i, n; struct dma_chan *chan; - lock_cpu_hotplug(); - if (net_dma_count == 0) { for_each_online_cpu(cpu) rcu_assign_pointer(per_cpu(softnet_data.net_dma, cpu), NULL); - unlock_cpu_hotplug(); return; } @@ -3444,8 +3441,6 @@ static void net_dma_rebalance(void) i++; } rcu_read_unlock(); - - unlock_cpu_hotplug(); } /** |