From d5a69ed759314c66c0d262cd5d9d0f2227bcc492 Mon Sep 17 00:00:00 2001
From: Benjamin Coddington <bcodding@redhat.com>
Date: Wed, 3 Mar 2021 08:47:16 -0500
Subject: [PATCH] SUNRPC: Set memalloc_nofs_save() for sync tasks
[ Upstream commit f0940f4b3284a00f38a5d42e6067c2aaa20e1f2e ]
We could recurse into NFS doing memory reclaim while sending a sync task,
which might result in a deadlock. Set memalloc_nofs_save for sync task
execution.
Fixes: a1231fda7e94 ("SUNRPC: Set memalloc_nofs_save() on all rpciod/xprtiod jobs")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sunrpc/sched.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 7afbf15bcbd9a..4beb6d2957c33 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -990,8 +990,11 @@ void rpc_execute(struct rpc_task *task)
rpc_set_active(task);
rpc_make_runnable(rpciod_workqueue, task);
- if (!is_async)
+ if (!is_async) {
+ unsigned int pflags = memalloc_nofs_save();
__rpc_execute(task);
+ memalloc_nofs_restore(pflags);
+ }
}
static void rpc_async_schedule(struct work_struct *work)
--
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