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driver core: don't always lock parent in shutdown

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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>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Tested-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20240822202805.6379-2-stuart.w.hayes@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stuart Hayes
2024-08-22 15:28:02 -05:00
committed by Greg Kroah-Hartman
parent 24e041e1e4
commit ba6353748e
1 changed files with 2 additions and 2 deletions
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4
drivers/base/core.c
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@@ -4816,7 +4816,7 @@ 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);
@@ -4840,7 +4840,7 @@ void device_shutdown(void)
}
device_unlock(dev);
if (parent)
if (parent && dev->bus && dev->bus->need_parent_lock)
device_unlock(parent);
put_device(dev);