[PATCH 1/5] driver core: do not always lock parent in shutdown

David Jeffery
2026-03-11T17:12:28Z

Don't lock a parent device unless it is needed in device_shutdown. This
is in preparation for making device shutdown asynchronous, when it will
be needed to allow children of a common parent to shut down
simultaneously.

Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: David Jeffery <djeffery@redhat.com>
Tested-by: Laurence Oberman <loberman@redhat.com>
---
drivers/base/core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 791f9e444df8..eb54fc9680de 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4819,7 +4819,7 @@ void device_shutdown(void)
spin_unlock(&devices_kset->list_lock);

/* hold lock to avoid race with probe/release */
- if (parent)
+ if (parent && dev->bus && dev->bus->need_parent_lock)
device_lock(parent);
device_lock(dev);

@@ -4843,7 +4843,7 @@ void device_shutdown(void)
}

device_unlock(dev);
- if (parent)
+ if (parent && dev->bus && dev->bus->need_parent_lock)
device_unlock(parent);

put_device(dev);
--
2.53.0