nfsd: fix a warning in __cld_pipe_upcall()
__cld_pipe_upcall() emits a "do not call blocking ops when
!TASK_RUNNING" warning due to the dput() call in rpc_queue_upcall().
Fix it by using a completion instead of hand coding the wait.
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 9c247fa1..5188f9f 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -662,7 +662,7 @@ struct cld_net {
struct cld_upcall {
struct list_head cu_list;
struct cld_net *cu_net;
- struct task_struct *cu_task;
+ struct completion cu_done;
struct cld_msg cu_msg;
};
@@ -671,23 +671,18 @@ __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
{
int ret;
struct rpc_pipe_msg msg;
+ struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_msg);
memset(&msg, 0, sizeof(msg));
msg.data = cmsg;
msg.len = sizeof(*cmsg);
- /*
- * Set task state before we queue the upcall. That prevents
- * wake_up_process in the downcall from racing with schedule.
- */
- set_current_state(TASK_UNINTERRUPTIBLE);
ret = rpc_queue_upcall(pipe, &msg);
if (ret < 0) {
- set_current_state(TASK_RUNNING);
goto out;
}
- schedule();
+ wait_for_completion(&cup->cu_done);
if (msg.errno < 0)
ret = msg.errno;
@@ -754,7 +749,7 @@ cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
return -EFAULT;
- wake_up_process(cup->cu_task);
+ complete(&cup->cu_done);
return mlen;
}
@@ -769,7 +764,7 @@ cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
if (msg->errno >= 0)
return;
- wake_up_process(cup->cu_task);
+ complete(&cup->cu_done);
}
static const struct rpc_pipe_ops cld_upcall_ops = {
@@ -900,7 +895,7 @@ alloc_cld_upcall(struct cld_net *cn)
goto restart_search;
}
}
- new->cu_task = current;
+ init_completion(&new->cu_done);
new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
new->cu_net = cn;