PCI: endpoint: Don't stop controller when unbinding endpoint function

stable inclusion
from stable-v5.10.137
commit ab3b82435f14518522544b24675e180d898d1d82
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ab3b82435f14518522544b24675e180d898d1d82

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[ Upstream commit 1bc2b7bf ]

Unbinding an endpoint function from the endpoint controller shouldn't stop
the controller.  This is especially a problem for multi-function endpoints
where other endpoints may still be active.

Don't stop the controller when unbinding one of its endpoints.  Normally
the controller is stopped via configfs.

Fixes: 349e7a85 ("PCI: endpoint: functions: Add an EP function to test PCI")
Link: https://lore.kernel.org/r/20220622040924.113279-1-mie@igel.co.jp


Signed-off-by: Shunsuke Mie <mie@igel.co.jp>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>