linux-kernel - [PATCH 4.14 087/100] driver core: Move device_links_purge() after bus_remove

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Message-Id: <20181129140106.334832162@linuxfoundation.org>
Date:   Thu, 29 Nov 2018 15:12:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeffy Chen <jeffy.chen@...k-chips.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.14 087/100] driver core: Move device_links_purge() after bus_remove_device()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeffy Chen <jeffy.chen@...k-chips.com>

commit 2ec16150179888b81717d1d3ce84e634f4736af2 upstream.

The current ordering of code in device_del() triggers a WARN_ON()
in device_links_purge(), because of an unexpected link status.

The device_links_unbind_consumers() call in device_release_driver()
has to take place before device_links_purge() for the status of all
links to be correct, so move the device_links_purge() call in
device_del() after the invocation of bus_remove_device() which calls
device_release_driver().

Fixes: 9ed9895370ae (driver core: Functional dependencies tracking support)
Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/base/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1973,7 +1973,6 @@ void device_del(struct device *dev)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_DEL_DEVICE, dev);

-	device_links_purge(dev);
 	dpm_sysfs_remove(dev);
 	if (parent)
 		klist_del(&dev->p->knode_parent);
@@ -2001,6 +2000,7 @@ void device_del(struct device *dev)
 	device_pm_remove(dev);
 	driver_deferred_probe_del(dev);
 	device_remove_properties(dev);
+	device_links_purge(dev);

 	/* Notify the platform of the removal, in case they
 	 * need to do anything...