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
pvrdma_idx_ring_has_[data/space] routines also return invalid index PVRDMA_INVALID_IDX[=-1], if ring has no data/space. Check return value from these routines to avoid plausible infinite loops. Reported-by: Li Qiang <liq3ea@163.com> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org> Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com> Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>