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    SubjectRe: [bug, 2.6.26-rc4/rc5] sporadic bootup crashes in blk_lookup_devt()/prepare_namespace()
    On Mon, 9 Jun 2008 20:11:09 -0700,
    Greg KH <gregkh@suse.de> wrote:

    > On Mon, Jun 09, 2008 at 07:15:21PM +0200, Cornelia Huck wrote:
    > > The driver core changes in -next convert class->sem to
    > > class->p->class_mutex, which makes it non-accessible to drivers.
    > > Most of the locking is easily done through converting to the class
    > > iterator functions, but there are some cases where this is not going to
    > > work:
    > >
    > > - The {register,unregister}_blkdev() functions, which don't directly
    > > involve the class.
    > > - The iterators for /proc/partitions, which take the lock in
    > > part_start() and give it up again in part_stop().
    > >
    > > Maybe we need a possibilty for a driver to lock a class from outside?
    >
    > Why would that be needed? We protect walking the class lists internally
    > with the lock, that should be sufficient, right?

    What about the two functions I cited above? Don't we want them
    protected by the same lock?


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