NFSv4: Fix a state manager thread deadlock regression

stable inclusion
from stable-v5.10.198
commit 2ad1a1d3d61641a75c44c8008e00720782ab375f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I987V5

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2ad1a1d3d61641a75c44c8008e00720782ab375f



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[ Upstream commit 956fd46f ]

Commit 4dc73c67 reintroduces the deadlock that was fixed by commit
aeabb3c9 ("NFSv4: Fix a NFSv4 state manager deadlock") because it
prevents the setup of new threads to handle reboot recovery, while the
older recovery thread is stuck returning delegations.

Fixes: 4dc73c67 ("NFSv4: keep state manager thread active if swap is enabled")
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>