mmc:fix Call mmc_init() when executing mmc_get_dev()
This code adds call to mmc_init(), for partition related commands (e.g. fatls, fatinfo etc.). It is safe to call mmc_init() multiple times since mmc->has_init flag prevents from multiple initialization. The FAT related code calls get_dev high level method and then uses elements from mmc->block_dev, which is uninitialized until the mmc_init (and thereof mmc_startup) is called. This problem appears on boards, which don't use mmc as the default place for envs Signed-off-by: NLukasz Majewski <l.majewski@samsung.com> Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com> Cc: Andy Fleming <afleming@gmail.com> Signed-off-by: NAndy Fleming <afleming@freescale.com>
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