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Prevent destruction of a uio_device while user space apps hold open file descriptors to that device. Further, access to the 'info' member of the struct uio_device is protected by spinlock. This is to ensure stale pointers to data not under control of the UIO subsystem are not dereferenced. Signed-off-by: Hamish Martin <[email protected]> Reviewed-by: Chris Packham <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>