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devres: WARN() and return, don't crash on device_del() of uninitialized device

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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@linux-foundation.org: cleanup]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Benjamin Herrenschmidt 2009-06-10 12:43:02 -07:00 committed by Greg Kroah-Hartman
parent 81e4e1ba7e
commit eb8d3c604f
1 changed files with 3 additions and 0 deletions
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3
drivers/base/devres.c
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@ -428,6 +428,9 @@ int devres_release_all(struct device *dev)
{ {
unsigned long flags; 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); spin_lock_irqsave(&dev->devres_lock, flags);
return release_nodes(dev, dev->devres_head.next, &dev->devres_head, return release_nodes(dev, dev->devres_head.next, &dev->devres_head,
flags); flags);