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| author |   Wei Liu <wei.liu2@citrix.com> | 2014-08-25 16:44:00 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-08-25 17:31:42 -0700 |
| commit | e24f8191cc35ae3780b4656a6befae8b8657edc2 (patch) | |
| tree | 63977cacb2047745e2bb00e06446dfaae7ff3548 /drivers/net/xen-netback/interface.c | |
| parent | Merge branch 'tso_fix' (diff) | |
| download | linux-dev-e24f8191cc35ae3780b4656a6befae8b8657edc2.tar.xz linux-dev-e24f8191cc35ae3780b4656a6befae8b8657edc2.zip | |
xen-netback: move netif_napi_add before binding interrupt
Interrupt is enabled when bind_interdomain_evtchn_to_irqhandler returns.
If there's interrupt pending interrupt handler is invoked.
NAPI needs to be initialised before binding interrupt otherwise the
interrupt handler will try to scheduling a NAPI instance that is not
initialised yet, resulting in kernel OOPS.
This fixes a regression introduced in ea2c5e13 ("xen-netback: move NAPI
add/remove calls").
Ideally function calls to create kthreads should also be moved before
binding but I intent to fix this regression with minimal changes and
refactor the code with another patch.
Reported-by: Thomas Leonard <talex5@gmail.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/xen-netback/interface.c')
| -rw-r--r-- | drivers/net/xen-netback/interface.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index e29e15dca86e..f379689dde30 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -576,6 +576,9 @@ int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref, init_waitqueue_head(&queue->dealloc_wq); atomic_set(&queue->inflight_packets, 0); + netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll, + XENVIF_NAPI_WEIGHT); + if (tx_evtchn == rx_evtchn) { /* feature-split-event-channels == 0 */ err = bind_interdomain_evtchn_to_irqhandler( @@ -629,9 +632,6 @@ int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref, wake_up_process(queue->task); wake_up_process(queue->dealloc_task); - netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll, - XENVIF_NAPI_WEIGHT); - return 0; err_rx_unbind: |