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Ensure that the PMU buffer is protected from autopoll requests overwriting its contents whilst existing PMU requests are in progress. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Tested-by: Finn Thain <fthain@telegraphics.com.au> Acked-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200623204936.24064-18-mark.cave-ayland@ilande.co.uk>