This has probably been reported already. In 3.19 this started showing up in the dmesg log when the mmcblk driver gets loaded:
"Driver 'mmcblk' needs updating - please use bus_type methods" Looks like it is caused by the re-factoring needed after the removal of struct mmc_driver. Both the mmc bus and the block driver register a shutdown and the two fail the driver_register sanity check resulting in the warning above. Thanks, Todor
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