linux-kernel - [PATCH v9 1/4] driver core: don't always lock parent in shutdown

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Message-Id: <20241009175746.46758-2-stuart.w.hayes@gmail.com>
Date: Wed,  9 Oct 2024 12:57:43 -0500
From: Stuart Hayes <stuart.w.hayes@...il.com>
To: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Martin Belanger <Martin.Belanger@...l.com>,
	Oliver O'Halloran <oohall@...il.com>,
	Daniel Wagner <dwagner@...e.de>,
	Keith Busch <kbusch@...nel.org>,
	Lukas Wunner <lukas@...ner.de>,
	David Jeffery <djeffery@...hat.com>,
	Jeremy Allison <jallison@....com>,
	Jens Axboe <axboe@...com>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	linux-nvme@...ts.infradead.org,
	Nathan Chancellor <nathan@...nel.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Bert Karwatzki <spasswolf@....de>
Cc: Stuart Hayes <stuart.w.hayes@...il.com>
Subject: [PATCH v9 1/4] driver core: don't always lock parent in shutdown

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@...il.com>
Signed-off-by: David Jeffery <djeffery@...hat.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 a4c853411a6b..2bf9730db056 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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);
-- 
2.39.3