[PATCH] mmc: dw_mmc: fix dw_mci_get_cd

[Kevin Hilman]

Zhangfei Gao <zhangfei.gao at linaro.org> writes:

> Introduced from commit bf626e5550f24aec24975a0e85ad8e572ca76a6b
> CDETECT is ignored since negated return value of mmc_gpio_get_cd(mmc)
> can not be checked by IS_ERR_VALUE.
> Add spin_lock_bh(&host->lock) for atomic accessing DW_MMC_CARD_PRESENT,
> otherwise sd detect may occasionally fail.
>
> Signed-off-by: Zhangfei Gao <zhangfei.gao at linaro.org>
> Reported-by: Kevin Hilman <khilman at linaro.org>
> Reviewed-by: Sachin Kamat <sachin.kamat at linaro.org>
> Tested-by: Sachin Kamat <sachin.kamat at linaro.org>

I didn't look at the patch in detail, but can at least confirm that
Arndale boots again in -next with this patch applied.

Tested-by: Kevin Hilman <khilman at linaro.org>

Kevin