[Devel] [PATCH RHEL7 COMMIT] Revert "nfs: protect callback execution against per-net callback thread shutdown"

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-693.1.1.vz7.37.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-693.1.1.vz7.37.22
------>
commit 118f85ebd4b9e495b9afd77ddc4b44ef2659570e
Author: Konstantin Khorenko <khorenko at virtuozzo.com>
Date:   Tue Nov 7 13:25:10 2017 +0300

    Revert "nfs: protect callback execution against per-net callback thread shutdown"
    
    This reverts commit 1164badab1522ad0c93076203fcf231cc846139f.
    
    The patch introduces another deadlock => rool back it for now.
    
    https://jira.sw.ru/browse/PSBM-75751
    
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
 fs/nfs/callback.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 82e8ed1..0beb275 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -118,7 +118,6 @@ nfs41_callback_svc(void *vrqstp)
 			continue;
 
 		prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
-		mutex_lock(&nfs_callback_mutex);
 		spin_lock_bh(&serv->sv_cb_lock);
 		if (!list_empty(&serv->sv_cb_list)) {
 			req = list_first_entry(&serv->sv_cb_list,
@@ -130,10 +129,8 @@ nfs41_callback_svc(void *vrqstp)
 			error = bc_svc_process(serv, req, rqstp);
 			dprintk("bc_svc_process() returned w/ error code= %d\n",
 				error);
-			mutex_unlock(&nfs_callback_mutex);
 		} else {
 			spin_unlock_bh(&serv->sv_cb_lock);
-			mutex_unlock(&nfs_callback_mutex);
 			schedule();
 			finish_wait(&serv->sv_cb_waitq, &wq);
 		}