[PATCH 1/9] devres: WARN() and return, don't crash on device_del() of uninitialized device

[Greg Kroah-Hartman]

From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>

I just debugged an obscure crash caused by a device_del() of a all NULL'd
out struct device (in usb-serial) and found that a patch like this one would
have saved me time (in addition to improved chances of a bug report from
users hitting similar driver bugs).

[akpm@xxxxxxxxxxxxxxxxxxxx: cleanup]
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/base/devres.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index e8beb8e..05dd307 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -428,6 +428,9 @@ int devres_release_all(struct device *dev)
 {
 	unsigned long flags;
 
+	/* Looks like an uninitialized device structure */
+	if (WARN_ON(dev->devres_head.next == NULL))
+		return -ENODEV;
 	spin_lock_irqsave(&dev->devres_lock, flags);
 	return release_nodes(dev, dev->devres_head.next, &dev->devres_head,
 			     flags);
-- 
1.6.3.2

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