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mmc: Delay the card_event callback into the mmc_rescan worker

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This change removes the callback from atomic context which it doesn't
need to be in, and puts it in line with the debounced rescan.

This code is based on these e-mail threads with Christian Daudt:

  https://lkml.org/lkml/2013/8/19/539
  https://lkml.org/lkml/2014/3/19/79

Signed-off-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
This commit is contained in:
Markus Mayer 2014-04-08 15:19:43 -07:00 committed by Chris Ball
parent bb8175a8aa
commit fa372a51cb
3 changed files with 8 additions and 3 deletions
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5
drivers/mmc/core/core.c
View file

@ -2403,6 +2403,11 @@ void mmc_rescan(struct work_struct *work)
container_of(work, struct mmc_host, detect.work);
int i;
if (host->trigger_card_event && host->ops->card_event) {
host->ops->card_event(host);
host->trigger_card_event = false;
}
if (host->rescan_disable)
return;

4
drivers/mmc/core/slot-gpio.c
View file

@ -32,9 +32,7 @@ static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
/* Schedule a card detection after a debounce timeout */
struct mmc_host *host = dev_id;
if (host->ops->card_event)
host->ops->card_event(host);
host->trigger_card_event = true;
mmc_detect_change(host, msecs_to_jiffies(200));
return IRQ_HANDLED;

2
include/linux/mmc/host.h
View file

@ -319,6 +319,8 @@ struct mmc_host {
int rescan_disable; /* disable card detection */
int rescan_entered; /* used with nonremovable devices */
bool trigger_card_event; /* card_event necessary */
struct mmc_card *card; /* device attached to this host */
wait_queue_head_t wq;