On 07/01/2014 01:39 PM, Fu, Zhonghui wrote:
>
> Hi, all
>
> The mmc_sdio_init_card(drivers/mmc/core/sdio.c) function calls mmc_alloc_card(drivers/mmc/core/bus.c) function to allocate a card structure. card->dev.bus is assigned with mmc_bus_type in mmc_alloc_card function. Why not assign sdio_bus_type to card->dev.bus?
sdio card, mmc card, sd card are all devices on the mmc bus, hence their
bus type is set to mmc_bus_type.
sdio function device is a device on the sdio bus, hence its bus type is
sdio_bus_type.
Hope this helps,
Aaron
>
>
> struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
> {
> struct mmc_card *card;
>
> card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
> if (!card)
> return ERR_PTR(-ENOMEM);
>
> card->host = host;
>
> device_initialize(&card->dev);
>
> card->dev.parent = mmc_classdev(host);
> card->dev.bus = &mmc_bus_type;
> card->dev.release = mmc_release_card;
> card->dev.type = type;
>
> return card;
> }
>
>
> Thanks,
> Zhonghui
>
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