2012/2/1 Ulf Hansson <[email protected]>:
> To prevent I/O as soon as possible at card removal, a new
> detect work is re-scheduled without a delay to let a rescan
> remove the card device as soon a possible.
>
> Additionally, MMC_CAP2_DETECT_ON_ERR can now be used to handle
> "slowly" removed cards that a scheduled detect work did not
> detect as removed. To prevent further I/O requests for these
> lingering removed cards, check if card has been removed and then
> schedule a detect work to properly remove it.
>
> Signed-off-by: Ulf Hansson <[email protected]>
> ---
>
> Changes in v2:
> - Updated according to review comments.
> - Merging two patches for this feature into one.
>
> ---
> drivers/mmc/core/core.c | 19 +++++++++++++++++--
> include/linux/mmc/host.h | 1 +
> 2 files changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index bec0bf2..26d3a66 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2077,18 +2077,33 @@ int _mmc_detect_card_removed(struct mmc_host *host)
> int mmc_detect_card_removed(struct mmc_host *host)
> {
> struct mmc_card *card = host->card;
> + int ret;
>
> WARN_ON(!host->claimed);
> /*
> * The card will be considered unchanged unless we have been asked to
> * detect a change or host requires polling to provide card detection.
> */
> - if (card && !host->detect_change && !(host->caps &
> MMC_CAP_NEEDS_POLL))
> + if (card && !host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)
> + && !(host->caps2 & MMC_CAP2_DETECT_ON_ERR))
> return mmc_card_removed(card);
>
> host->detect_change = 0;
>
> - return _mmc_detect_card_removed(host);
> + ret = mmc_card_removed(card);
Hi. Ulf.
1. Is there no case that card is null ?
2. and Eventually mmc_card_removed is once called in any case. can we
change it like this ?
if (card)
ret = mmc_card_removed(card);
if(!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL)
&& !(host->caps2 & MMC_CAP2_DETECT_ON_ERR))
return ret;
> + if (!ret) {
> + ret = _mmc_detect_card_removed(host);
> + if (ret) {
> + /*
> + * Schedule a detect work as soon as possible to let a
> + * rescan handle the card removal.
> + */
> + cancel_delayed_work(&host->detect);
> + mmc_detect_change(host, 0);
> + }
> + }
> +
> + return ret;
> }
> EXPORT_SYMBOL(mmc_detect_card_removed);
>
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index dd13e05..368a2b9 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -257,6 +257,7 @@ struct mmc_host {
> #define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */
> #define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \
> MMC_CAP2_HS200_1_2V_SDR)
> +#define MMC_CAP2_DETECT_ON_ERR (1 << 7) /* On I/O err check card
> removal */
>
> mmc_pm_flag_t pm_caps; /* supported pm features */
> unsigned int power_notify_type;
> --
> 1.7.5.4
>
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