On Wed, January 15, 2014, Zhangfei Gao wrote:
> 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@xxxxxxxxxx>
> Reported-by: Kevin Hilman <khilman@xxxxxxxxxx>
> Reviewed-by: Sachin Kamat <sachin.kamat@xxxxxxxxxx>
> Tested-by: Sachin Kamat <sachin.kamat@xxxxxxxxxx>
> ---
> drivers/mmc/host/dw_mmc.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index a776f24f4311..9ded62c8225e 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1033,7 +1033,8 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
> int present;
> struct dw_mci_slot *slot = mmc_priv(mmc);
> struct dw_mci_board *brd = slot->host->pdata;
> - int gpio_cd = !mmc_gpio_get_cd(mmc);
> + struct dw_mci *host = slot->host;
> + int gpio_cd = mmc_gpio_get_cd(mmc);
>
> /* Use platform get_cd function, else try onboard card detect */
> if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
> @@ -1041,11 +1042,12 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
> else if (brd->get_cd)
> present = !brd->get_cd(slot->id);
> else if (!IS_ERR_VALUE(gpio_cd))
> - present = !!gpio_cd;
> + present = !gpio_cd;
!!gpio_cd or gpio_cd is correct, isn't it?
Thanks,
Seungwon Jeon
> else
> present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
> == 0 ? 1 : 0;
>
> + spin_lock_bh(&host->lock);
> if (present) {
> set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
> dev_dbg(&mmc->class_dev, "card is present\n");
> @@ -1053,6 +1055,7 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
> clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
> dev_dbg(&mmc->class_dev, "card is not present\n");
> }
> + spin_unlock_bh(&host->lock);
>
> return present;
> }
> @@ -2081,7 +2084,7 @@ static int dw_mci_of_get_wp_gpio(struct device *dev, u8 slot)
> return gpio;
> }
>
> -/* find the cd gpio for a given slot; or -1 if none specified */
> +/* find the cd gpio for a given slot */
> static void dw_mci_of_get_cd_gpio(struct device *dev, u8 slot,
> struct mmc_host *mmc)
> {
> --
> 1.7.9.5
>
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