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commit 60c519c5d3629c21ba356782434d5b612d312de4 upstream. TRCVIPCSSCTLR is not present if the TRCIDR4.NUMPC > 0. Thus we should only access the register if it is present, preventing any undesired behavior. Cc: stable@vger.kernel.org Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20201127175256.1092685-8-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>