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| author | Juergen Gross <jgross@suse.com> | 2018-09-07 14:21:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 08:35:07 +0200 |
| commit | a739cb3e04a2f87bf29119a61cb2f77483ae228b (patch) | |
| tree | 5a6d35c9f101ddad3f161e83dd5ba4223b72ccd7 | |
| parent | 1cd01dba1355e291f636555b1920625ed58c1623 (diff) | |
| download | linux-stable-a739cb3e04a2f87bf29119a61cb2f77483ae228b.tar.gz linux-stable-a739cb3e04a2f87bf29119a61cb2f77483ae228b.tar.bz2 linux-stable-a739cb3e04a2f87bf29119a61cb2f77483ae228b.zip | |
xen/netfront: fix waiting for xenbus state change
commit 8edfe2e992b75aee3da9316e9697c531194c2f53 upstream.
Commit 822fb18a82aba ("xen-netfront: wait xenbus state change when load
module manually") added a new wait queue to wait on for a state change
when the module is loaded manually. Unfortunately there is no wakeup
anywhere to stop that waiting.
Instead of introducing a new wait queue rename the existing
module_unload_q to module_wq and use it for both purposes (loading and
unloading).
As any state change of the backend might be intended to stop waiting
do the wake_up_all() in any case when netback_changed() is called.
Fixes: 822fb18a82aba ("xen-netfront: wait xenbus state change when load module manually")
Cc: <stable@vger.kernel.org> #4.18
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/xen-netfront.c | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index c48665eae9ee..3270b4333668 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -86,8 +86,7 @@ struct netfront_cb { /* IRQ name is queue name with "-tx" or "-rx" appended */ #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) -static DECLARE_WAIT_QUEUE_HEAD(module_load_q); -static DECLARE_WAIT_QUEUE_HEAD(module_unload_q); +static DECLARE_WAIT_QUEUE_HEAD(module_wq); struct netfront_stats { u64 packets; @@ -1336,11 +1335,11 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev) netif_carrier_off(netdev); xenbus_switch_state(dev, XenbusStateInitialising); - wait_event(module_load_q, - xenbus_read_driver_state(dev->otherend) != - XenbusStateClosed && - xenbus_read_driver_state(dev->otherend) != - XenbusStateUnknown); + wait_event(module_wq, + xenbus_read_driver_state(dev->otherend) != + XenbusStateClosed && + xenbus_read_driver_state(dev->otherend) != + XenbusStateUnknown); return netdev; exit: @@ -2025,15 +2024,14 @@ static void netback_changed(struct xenbus_device *dev, dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); + wake_up_all(&module_wq); + switch (backend_state) { case XenbusStateInitialising: case XenbusStateInitialised: case XenbusStateReconfiguring: case XenbusStateReconfigured: - break; - case XenbusStateUnknown: - wake_up_all(&module_unload_q); break; case XenbusStateInitWait: @@ -2049,12 +2047,10 @@ static void netback_changed(struct xenbus_device *dev, break; case XenbusStateClosed: - wake_up_all(&module_unload_q); if (dev->state == XenbusStateClosed) break; /* Missed the backend's CLOSING state -- fallthrough */ case XenbusStateClosing: - wake_up_all(&module_unload_q); xenbus_frontend_closed(dev); break; } @@ -2162,14 +2158,14 @@ static int xennet_remove(struct xenbus_device *dev) if (xenbus_read_driver_state(dev->otherend) != XenbusStateClosed) { xenbus_switch_state(dev, XenbusStateClosing); - wait_event(module_unload_q, + wait_event(module_wq, xenbus_read_driver_state(dev->otherend) == XenbusStateClosing || xenbus_read_driver_state(dev->otherend) == XenbusStateUnknown); xenbus_switch_state(dev, XenbusStateClosed); - wait_event(module_unload_q, + wait_event(module_wq, xenbus_read_driver_state(dev->otherend) == XenbusStateClosed || xenbus_read_driver_state(dev->otherend) == |