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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>
This commit is contained in:
Wei Liu 2014-08-25 16:44:00 +01:00 committed by David S. Miller
parent 8dbb200fa4
commit e24f8191cc
1 changed files with 3 additions and 3 deletions
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6
drivers/net/xen-netback/interface.c
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@ -576,6 +576,9 @@ int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref,
init_waitqueue_head(&queue->dealloc_wq); init_waitqueue_head(&queue->dealloc_wq);
atomic_set(&queue->inflight_packets, 0); atomic_set(&queue->inflight_packets, 0);
netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
XENVIF_NAPI_WEIGHT);
if (tx_evtchn == rx_evtchn) { if (tx_evtchn == rx_evtchn) {
/* feature-split-event-channels == 0 */ /* feature-split-event-channels == 0 */
err = bind_interdomain_evtchn_to_irqhandler( 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->task);
wake_up_process(queue->dealloc_task); wake_up_process(queue->dealloc_task);
netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
XENVIF_NAPI_WEIGHT);
return 0; return 0;
err_rx_unbind: err_rx_unbind: