linux-kernel - [PATCH] driver core: platform: don't oops on unbound devices

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Date:   Sat, 12 Dec 2020 04:14:26 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] driver core: platform: don't oops on unbound devices

Platform code stopped checking if the device is bound to the actual
platform driver, thus calling non-existing drv->shutdown(). Verify that
_dev->driver is not NULL before calling remove/shutdown callbacks.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Fixes: 9c30921fe799 ("driver core: platform: use bus_type functions")
---
 drivers/base/platform.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0358dc3ea3ad..93f44e69b472 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1342,7 +1342,7 @@ static int platform_remove(struct device *_dev)
 	struct platform_device *dev = to_platform_device(_dev);
 	int ret = 0;
 
-	if (drv->remove)
+	if (_dev->driver && drv->remove)
 		ret = drv->remove(dev);
 	dev_pm_domain_detach(_dev, true);
 
@@ -1354,7 +1354,7 @@ static void platform_shutdown(struct device *_dev)
 	struct platform_driver *drv = to_platform_driver(_dev->driver);
 	struct platform_device *dev = to_platform_device(_dev);
 
-	if (drv->shutdown)
+	if (_dev->driver && drv->shutdown)
 		drv->shutdown(dev);
 }
 
-- 
2.29.2