[DLM] Fix spin lock already unlocked bug
I just noticed this message when testing some other changes I'd made to
lowcomms (to use workqueues) but the problem seems to be in the current
git trees too. I'm amazed no-one has seen it.
BUG: spinlock already unlocked on CPU#1, dlm_recoverd/16868
Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/dlm/lowcomms-tcp.c b/fs/dlm/lowcomms-tcp.c
index 18b91c6..ce5e7cd 100644
--- a/fs/dlm/lowcomms-tcp.c
+++ b/fs/dlm/lowcomms-tcp.c
@@ -709,6 +709,7 @@
if (!con)
return NULL;
+ spin_lock(&con->writequeue_lock);
e = list_entry(con->writequeue.prev, struct writequeue_entry, list);
if ((&e->list == &con->writequeue) ||
(PAGE_CACHE_SIZE - e->end < len)) {
@@ -747,6 +748,7 @@
struct connection *con = e->con;
int users;
+ spin_lock(&con->writequeue_lock);
users = --e->users;
if (users)
goto out;