[U-Boot] [PATCH] ums: Add "dev num" parameter. Check mmc device before do ums init.

[Przemyslaw Marczak <p.marczak@samsung.com>]

On 09/04/2013 02:34 PM, Marek Vasut wrote:
> Dear Przemyslaw Marczak,
>
>> Hello Marek,
>> Thank you for reply.
>>
>> On 09/04/2013 12:26 AM, Marek Vasut wrote:
>>> Dear Przemyslaw Marczak,
>>>
>>>> This change allows using every mmc device instance with ums, like eMMC
>>>> or SD cards. Now MMC device is checked before ums is inited.
>>>>
>>>> Example of use: ums <device_number> for mmc devices.
>>>>
>>>> Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
>>>> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
>>>> CC: Marek Vasut <marek.vasut@gmail.com>
>>>> ---
>>>>
>>>>    board/samsung/trats/trats.c   |   12 +++---------
>>>>    common/cmd_usb_mass_storage.c |   30 ++++++++++++++----------------
>>>>    include/usb_mass_storage.h    |    4 ++--
>>>>    3 files changed, 19 insertions(+), 27 deletions(-)
>>>>
>>>> diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
>>>> index 7f61d17..b7f7b05 100644
>>>> --- a/board/samsung/trats/trats.c
>>>> +++ b/board/samsung/trats/trats.c
>>>> @@ -816,17 +816,11 @@ static struct ums_board_info ums_board = {
>>>>
>>>>    	},
>>>>
>>>>    };
>>>>
>>>> -struct ums_board_info *board_ums_init(unsigned int dev_num, unsigned
>>>> int offset, -				      unsigned int part_size)
>>>> +struct ums_board_info *board_ums_init(struct mmc *mmc, unsigned int
>>>> offset, +					unsigned int part_size)
>>>>
>>>>    {
>>>>
>>>> -	struct mmc *mmc;
>>>> -
>>>> -	mmc = find_mmc_device(dev_num);
>>>> -	if (!mmc)
>>>> -		return NULL;
>>>> -
>>>>
>>>>    	ums_board.ums_dev.mmc = mmc;
>>>>
>>>> -	ums_board.ums_dev.dev_num = dev_num;
>>>> +	ums_board.ums_dev.dev_num = mmc->block_dev.dev;
>>>
>>> You already pass "mmc", why pass mmc->block_dev.dev too? Is it not a
>>> little redundant?
>>
>> You are right, it is little redundant but pointer to this structure is
>> returned so we expect that structure fields were proper filled, right?
>
> Why not just remove the dev_num field ? The UMS core can retrieve that
> information itself.
>
> [...]
>
> Best regards,
> Marek Vasut
>

Hello,
I'm making little UMS code refactor now. I will consider your suggestion.

Regards,
-- 
Przemyslaw Marczak
Samsung R&D Institute Poland
Samsung Electronics
p.marczak at samsung.com