datapath: Correctly return error if percpu allocation fails.

If the allocation of percpu stats fails when creating a new
datapath, we currently don't return the correct error code.  Since
we don't explicitly set it when the allocation fails it will keep
the value from the previous call.  This means we will return success
when the creation actually failed.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 0205fd2..fded95c 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -270,8 +270,10 @@ static int create_dp(int dp_idx, const char __user *devnamep)
 
        dp->drop_frags = 0;
        dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
-       if (!dp->stats_percpu)
+       if (!dp->stats_percpu) {
+               err = -ENOMEM;
                goto err_destroy_local_port;
+       }
 
        rcu_assign_pointer(dps[dp_idx], dp);
        dp_sysfs_add_dp(dp);