[Xen-devel] [PATCH net v2] xen-netback: clear vif->task on disconnect

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

xenvif_start_xmit() relies on checking vif->task for NULL to determine
whether the vif is ready to accept packets. The task thread is stopped in
xenvif_disconnect() but task is not set to NULL. Thus, on a re-connect the
check will give a false positive.

Also since commit ea732dff5cfa10789007bf4a5b935388a0bb2a8f (Handle backend
state transitions in a more robust way) it should not be possible for
xenvif_connect() to be called if the vif is already connected so change the
check of vif->tx_irq to a BUG_ON() and also add a BUG_ON(vif->task).

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
---
v2
- Make sure vif->task remains NULL in xenvif_connect() if  kthread_create()
  fails
- Fix patch comment

 drivers/net/xen-netback/interface.c |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/net/xen-netback/interface.c 
b/drivers/net/xen-netback/interface.c
index 2329ccc..870f1fa 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -368,11 +368,11 @@ int xenvif_connect(struct xenvif *vif, unsigned long 
tx_ring_ref,
                   unsigned long rx_ring_ref, unsigned int tx_evtchn,
                   unsigned int rx_evtchn)
 {
+       struct task_struct *task;
        int err = -ENOMEM;
 
-       /* Already connected through? */
-       if (vif->tx_irq)
-               return 0;
+       BUG_ON(vif->tx_irq);
+       BUG_ON(vif->task);
 
        err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
        if (err < 0)
@@ -411,14 +411,16 @@ int xenvif_connect(struct xenvif *vif, unsigned long 
tx_ring_ref,
        }
 
        init_waitqueue_head(&vif->wq);
-       vif->task = kthread_create(xenvif_kthread,
-                                  (void *)vif, "%s", vif->dev->name);
-       if (IS_ERR(vif->task)) {
+       task = kthread_create(xenvif_kthread,
+                             (void *)vif, "%s", vif->dev->name);
+       if (IS_ERR(task)) {
                pr_warn("Could not allocate kthread for %s\n", vif->dev->name);
-               err = PTR_ERR(vif->task);
+               err = PTR_ERR(task);
                goto err_rx_unbind;
        }
 
+       vif->task = task;
+
        rtnl_lock();
        if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
                dev_set_mtu(vif->dev, ETH_DATA_LEN);
@@ -461,8 +463,10 @@ void xenvif_disconnect(struct xenvif *vif)
        if (netif_carrier_ok(vif->dev))
                xenvif_carrier_off(vif);
 
-       if (vif->task)
+       if (vif->task) {
                kthread_stop(vif->task);
+               vif->task = NULL;
+       }
 
        if (vif->tx_irq) {
                if (vif->tx_irq == vif->rx_irq)
-- 
1.7.10.4


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