tipc: Revise comment justifying release of configuration spinlock

Comment-only change to better explain why TIPC's configuration lock is
temporarily released while activating support for network interfaces,
and why the existing activation code doesn't require rework.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/net/tipc/config.c b/net/tipc/config.c
index b25a396b7e1e..4785bf26cdf4 100644
--- a/net/tipc/config.c
+++ b/net/tipc/config.c
@@ -184,13 +184,12 @@ static struct sk_buff *cfg_set_own_addr(void)
                                                    " (cannot change node address once assigned)");
 
         /*
-         * Must release all spinlocks before calling start_net() because
-         * Linux version of TIPC calls eth_media_start() which calls
-         * register_netdevice_notifier() which may block!
-         *
-         * Temporarily releasing the lock should be harmless for non-Linux TIPC,
-         * but Linux version of eth_media_start() should really be reworked
-         * so that it can be called with spinlocks held.
+         * Must temporarily release configuration spinlock while switching into
+         * networking mode as it calls tipc_eth_media_start(), which may sleep.
+         * Releasing the lock is harmless as other locally-issued configuration
+         * commands won't occur until this one completes, and remotely-issued
+         * configuration commands can't be received until a local configuration
+         * command to enable the first bearer is received and processed.
          */
 
         spin_unlock_bh(&config_lock);