staging/rdma/hfi1: Fix for module parameter hdrq_entsize when it's 0
If driver is loaded with parameter hdrq_entsize=0, then there's a NULL dereference when the driver gets unloaded. This causes a kernel Oops and prevents the module from being unloaded. This patch fixes this issue by making sure -EINVAL gets returned when hdrq_entsize=0. Reviewed-by: Chegondi, Harish <harish.chegondi@intel.com> Reviewed-by: Haralanov, Mitko <mitko.haralanov@intel.com> Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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