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This patch introduces an interface to read and write PCI-X / PCI-Express maximum read byte count values from PCI config space. There is a second function that returns the maximum _designed_ read byte count, which marks the maximum value for a device, since some drivers try to set MMRBC to the highest allowed value and rely on such a function. Based on patch set by Stephen Hemminger <shemminger@linux-foundation.org> Cc: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: Peter Oruba <peter.oruba@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>