driver core: prevent device_for_each_child from oopsing
David Vrabel noticed that the wireless usb stack likes to call device_for_each_chile() with an empty bus. This used to work fine, but now oopses. This patch fixes the oops and makes the code behave like it used to. Reported-by: David Vrabel <david.vrabel@csr.com> Tested-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1142,6 +1142,9 @@ int device_for_each_child(struct device *parent, void *data,
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struct device *child;
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struct device *child;
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int error = 0;
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int error = 0;
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if (!parent->p)
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return 0;
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klist_iter_init(&parent->p->klist_children, &i);
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klist_iter_init(&parent->p->klist_children, &i);
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while ((child = next_device(&i)) && !error)
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while ((child = next_device(&i)) && !error)
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error = fn(child, data);
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error = fn(child, data);
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