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SET_BLOCK_COUNT CMD23 is needed for all access to RPMB partition. If block count is not set by CMD23, all subsequent read/write commands fail as per eMMC specification. So, If the host does not support CMD23, do not expose RPMB partition. Accessing RPMB partition can cause hang / huge delay for hosts which do not support CMD23. Signed-off-by: Balaji T K <balajitk@ti.com> Reported-and-Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Chris Ball <cjb@laptop.org>