dp_netdev_free() must free 'dp->upcall_rwlock', but when upcalls are disabled
(if the datapath is being freed upcalls should be disabled) 'dp->upcall_rwlock'
is taken and freeing it causes an assertion to fail.
This commit takes makes sure that the upcalls are disabled and releases
'dp->upcall_rwlock' before freeing it. A simple testcase is added to detect the
failure.
Signed-off-by: Daniele Di Proietto <ddiproie...@vmware.com>
---
lib/dpif-netdev.c | 17 ++++++++++++++++-
tests/dpif-netdev.at | 8 ++++++++
2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 2476435..7978959 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -592,6 +592,18 @@ dpif_netdev_open(const struct dpif_class *class, const
char *name,
return error;
}
+static void
+dp_netdev_destroy_upcall_lock(struct dp_netdev *dp)
+ OVS_NO_THREAD_SAFETY_ANALYSIS
+{
+ /* Check that upcalls are disabled, i.e. that the rwlock is taken */
+ ovs_assert(fat_rwlock_tryrdlock(&dp->upcall_rwlock));
+
+ /* Before freeing a lock we should release it */
+ fat_rwlock_unlock(&dp->upcall_rwlock);
+ fat_rwlock_destroy(&dp->upcall_rwlock);
+}
+
/* Requires dp_netdev_mutex so that we can't get a new reference to 'dp'
* through the 'dp_netdevs' shash while freeing 'dp'. */
static void
@@ -625,7 +637,10 @@ dp_netdev_free(struct dp_netdev *dp)
ovs_mutex_destroy(&dp->flow_mutex);
seq_destroy(dp->port_seq);
cmap_destroy(&dp->ports);
- fat_rwlock_destroy(&dp->upcall_rwlock);
+
+ /* Upcalls must be disabled at this point */
+ dp_netdev_destroy_upcall_lock(dp);
+
latch_destroy(&dp->exit_latch);
emc_cache_uninit(&dp->flow_cache);
diff --git a/tests/dpif-netdev.at b/tests/dpif-netdev.at
index c50b1a8..69d561b 100644
--- a/tests/dpif-netdev.at
+++ b/tests/dpif-netdev.at
@@ -122,3 +122,11 @@
skb_priority(0),skb_mark(0/0),recirc_id(0),dp_hash(0/0),in_port(1),eth(src=50:54
OVS_VSWITCHD_STOP
AT_CLEANUP
+
+AT_SETUP([dpif-netdev - Datapath removal])
+OVS_VSWITCHD_START()
+AT_CHECK([ovs-appctl dpctl/add-dp dummy@br0])
+AT_CHECK([ovs-appctl dpctl/del-dp dummy@br0])
+
+OVS_VSWITCHD_STOP
+AT_CLEANUP
--
2.1.0.rc1
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