On 04/28/2016 07:55 PM, Ulf Hansson wrote:
> As cancel_delayed_work_sync() prevents an executing work for re-scheduling
> itself, the rescan_disable flag is redundant.
>
> Morover, during host registration phase, it's anyway not safe to schedule a
> detect work until mmc_start_host() has been invoked. Therfore, there's no
> need to use the rescan_disable flag to protect a rescan work from being
> executed in-between mmc_alloc_host() and mmc_start_host().
>
> For these reasons, let's remove the rescan_disable flag.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> ---
> drivers/mmc/core/core.c | 12 ------------
> drivers/mmc/core/host.c | 3 ---
> include/linux/mmc/host.h | 1 -
> 3 files changed, 16 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 99275e4..b8c6a11 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2580,9 +2580,6 @@ void mmc_rescan(struct work_struct *work)
> container_of(work, struct mmc_host, detect.work);
> int i;
>
> - if (host->rescan_disable)
> - return;
> -
> /* If there is a non-removable card registered, only scan once */
> if (!mmc_card_is_removable(host) && host->rescan_entered)
> return;
> @@ -2649,7 +2646,6 @@ void mmc_rescan(struct work_struct *work)
> void mmc_start_host(struct mmc_host *host)
> {
> host->f_init = max(freqs[0], host->f_min);
> - host->rescan_disable = 0;
> host->ios.power_mode = MMC_POWER_UNDEFINED;
>
> mmc_claim_host(host);
> @@ -2674,7 +2670,6 @@ void mmc_stop_host(struct mmc_host *host)
> if (host->slot.cd_irq >= 0)
> disable_irq(host->slot.cd_irq);
>
> - host->rescan_disable = 1;
> cancel_delayed_work_sync(&host->detect);
>
> /* clear pm flags now and let card drivers set them as needed */
> @@ -2788,9 +2783,6 @@ static int mmc_pm_notify(struct notifier_block *notify_block,
> case PM_HIBERNATION_PREPARE:
> case PM_SUSPEND_PREPARE:
> case PM_RESTORE_PREPARE:
> - spin_lock_irqsave(&host->lock, flags);
> - host->rescan_disable = 1;
> - spin_unlock_irqrestore(&host->lock, flags);
> cancel_delayed_work_sync(&host->detect);
Maybe you can remove the defined "flags" variable.
Best Regards,
Jaehoon Chung
>
> if (!host->bus_ops)
> @@ -2814,10 +2806,6 @@ static int mmc_pm_notify(struct notifier_block *notify_block,
> case PM_POST_SUSPEND:
> case PM_POST_HIBERNATION:
> case PM_POST_RESTORE:
> -
> - spin_lock_irqsave(&host->lock, flags);
> - host->rescan_disable = 0;
> - spin_unlock_irqrestore(&host->lock, flags);
> _mmc_detect_change(host, 0, false);
>
> }
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index e0a3ee1..e972489 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -319,9 +319,6 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
> if (!host)
> return NULL;
>
> - /* scanning will be enabled when we're ready */
> - host->rescan_disable = 1;
> -
> again:
> if (!ida_pre_get(&mmc_host_ida, GFP_KERNEL)) {
> kfree(host);
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 85800b4..7fbe5c0 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -330,7 +330,6 @@ struct mmc_host {
> unsigned int doing_retune:1; /* re-tuning in progress */
> unsigned int retune_now:1; /* do re-tuning at next req */
>
> - int rescan_disable; /* disable card detection */
> int rescan_entered; /* used with nonremovable devices */
>
> int need_retune; /* re-tuning is needed */
>
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