diff options
| author | Bob Peterson <rpeterso@redhat.com> | 2016-10-10 16:19:52 +0300 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2016-10-19 19:00:03 +0300 |
| commit | d2fee58a3bb15b2b8f1eaff14aa3432cf0f35d8c (patch) | |
| tree | f1df5567b2efcc956e5947d4256d0ee9763e0dfb /fs/dlm | |
| parent | 3735b4b9f1c102dcaf70241225339bdea4447dc8 (diff) | |
| download | linux-d2fee58a3bb15b2b8f1eaff14aa3432cf0f35d8c.tar.xz | |
dlm: remove lock_sock to avoid scheduling while atomic
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 <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm')
| -rw-r--r-- | fs/dlm/lowcomms.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 485494e5a28e..df680a26141b 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); } |