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TRCSTALLCTLR register is only implemented if TRCIDR3.STALLCTL == 0b1 Make sure the driver touches the register only it is implemented. Link: https://lore.kernel.org/r/20210127184617.3684379-1-suzuki.poulose@arm.com Cc: stable@vger.kernel.org Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Leo Yan <leo.yan@linaro.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/20210201181351.1475223-32-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>