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SubjectRe: Missing piece from as659
On Fri, Feb 24, 2006 at 12:53:01PM -0500, Alan Stern wrote:
> On Fri, 24 Feb 2006, Matthew Wilcox wrote:
> > http://www.ussg.iu.edu/hypermail/linux/kernel/0602.2/2673.html
> > If it is a bug, of course. It's not clear to me whether it's permissible
> > to call pci_dev_put under a spinlock or not. That boils down to whether
> > kobject ->release methods can sleep or not. That isn't documented in
> > Documentation/kobject.txt and I rather think it should be.
>
> It is a bug, but it has been ignored up until recently. Within the last
> month or two, Greg added a might_sleep() call to put_device(). It
> wouldn't hurt to do the same thing to kobject_put(), or maybe just
> kobject_release().

kobject_put() will not necessarily sleep, it's only the device_put that
will, due to the locking in the driver core.

thanks,

greg k-h
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