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authorAllan Stephens <allan.stephens@windriver.com>2011-10-18 22:47:02 +0400
committerPaul Gortmaker <paul.gortmaker@windriver.com>2011-12-27 20:33:40 +0400
commitbfec73d7e45cdf570d649a547050295789e1e6fb (patch)
tree5dad32b2f41b1c250a60c88fc5f4877253b88d13 /net/tipc/config.c
parent5c216e1d28c82332db0fa53e30536577fb6130c6 (diff)
downloadlinux-bfec73d7e45cdf570d649a547050295789e1e6fb.tar.xz
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>
Diffstat (limited to 'net/tipc/config.c')
-rw-r--r--net/tipc/config.c13
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);