[Cluster-devel] [DLM PATCH] DLM: Remove lock_sock to avoid scheduling while atomic

[Bob Peterson]

Hi,

Before this patch, functions save_callbacks and restore_callbacks
called function lock_sock and release_sock to prevent other processes
from messing with the struct sock while the callbacks were saved and
restored. However, function add_sock calls write_lock_bh prior to
calling it save_callbacks, which disables preempts. So the call to
lock_sock would try to schedule when we can't schedule.

Signed-off-by: Bob Peterson <rpete...@redhat.com>
---
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 963016c..8c41dbe 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -519,24 +519,20 @@ out:
 /* Note: sk_callback_lock must be locked before calling this function. */
 static void save_callbacks(struct connection *con, struct sock *sk)
 {
-       lock_sock(sk);
        con->orig_data_ready = sk->sk_data_ready;
        con->orig_state_change = sk->sk_state_change;
        con->orig_write_space = sk->sk_write_space;
        con->orig_error_report = sk->sk_error_report;
-       release_sock(sk);
 }
 
 static void restore_callbacks(struct connection *con, struct sock *sk)
 {
        write_lock_bh(&sk->sk_callback_lock);
-       lock_sock(sk);
        sk->sk_user_data = NULL;
        sk->sk_data_ready = con->orig_data_ready;
        sk->sk_state_change = con->orig_state_change;
        sk->sk_write_space = con->orig_write_space;
        sk->sk_error_report = con->orig_error_report;
-       release_sock(sk);
        write_unlock_bh(&sk->sk_callback_lock);
 }