mmc: allow upper layers to know immediately if card has been removed
Add a function mmc_detect_card_removed() which upper layers can use to
determine immediately if a card has been removed. This function should
be called after an I/O request fails so that all queued I/O requests
can be errored out immediately instead of waiting for the card device
to be removed.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 950b97d..a2aa860 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -140,7 +140,7 @@
cmd->retries = 0;
}
- if (err && cmd->retries) {
+ if (err && cmd->retries && !mmc_card_removed(host->card)) {
/*
* Request starter must handle retries - see
* mmc_wait_for_req_done().
@@ -247,6 +247,11 @@
{
init_completion(&mrq->completion);
mrq->done = mmc_wait_done;
+ if (mmc_card_removed(host->card)) {
+ mrq->cmd->error = -ENOMEDIUM;
+ complete(&mrq->completion);
+ return;
+ }
mmc_start_request(host, mrq);
}
@@ -259,7 +264,8 @@
wait_for_completion(&mrq->completion);
cmd = mrq->cmd;
- if (!cmd->error || !cmd->retries)
+ if (!cmd->error || !cmd->retries ||
+ mmc_card_removed(host->card))
break;
pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
@@ -1456,7 +1462,7 @@
WARN_ON(host->removed);
spin_unlock_irqrestore(&host->lock, flags);
#endif
-
+ host->detect_change = 1;
mmc_schedule_delayed_work(&host->detect, delay);
}
@@ -2049,6 +2055,43 @@
return -EIO;
}
+int _mmc_detect_card_removed(struct mmc_host *host)
+{
+ int ret;
+
+ if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
+ return 0;
+
+ if (!host->card || mmc_card_removed(host->card))
+ return 1;
+
+ ret = host->bus_ops->alive(host);
+ if (ret) {
+ mmc_card_set_removed(host->card);
+ pr_debug("%s: card remove detected\n", mmc_hostname(host));
+ }
+
+ return ret;
+}
+
+int mmc_detect_card_removed(struct mmc_host *host)
+{
+ struct mmc_card *card = host->card;
+
+ 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))
+ return mmc_card_removed(card);
+
+ host->detect_change = 0;
+
+ return _mmc_detect_card_removed(host);
+}
+EXPORT_SYMBOL(mmc_detect_card_removed);
+
void mmc_rescan(struct work_struct *work)
{
static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
@@ -2069,6 +2112,8 @@
&& !(host->caps & MMC_CAP_NONREMOVABLE))
host->bus_ops->detect(host);
+ host->detect_change = 0;
+
/*
* Let mmc_bus_put() free the bus/bus_ops if we've found that
* the card is no longer present.
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 14664f1..3400924 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -24,6 +24,7 @@
int (*resume)(struct mmc_host *);
int (*power_save)(struct mmc_host *);
int (*power_restore)(struct mmc_host *);
+ int (*alive)(struct mmc_host *);
};
void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
@@ -59,6 +60,8 @@
void mmc_start_host(struct mmc_host *host);
void mmc_stop_host(struct mmc_host *host);
+int _mmc_detect_card_removed(struct mmc_host *host);
+
int mmc_attach_mmc(struct mmc_host *host);
int mmc_attach_sd(struct mmc_host *host);
int mmc_attach_sdio(struct mmc_host *host);
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index d240427..fc1059b 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1105,6 +1105,14 @@
}
/*
+ * Card detection - card is alive.
+ */
+static int mmc_alive(struct mmc_host *host)
+{
+ return mmc_send_status(host->card, NULL);
+}
+
+/*
* Card detection callback from host.
*/
static void mmc_detect(struct mmc_host *host)
@@ -1119,7 +1127,7 @@
/*
* Just check if our card has been removed.
*/
- err = mmc_send_status(host->card, NULL);
+ err = _mmc_detect_card_removed(host);
mmc_release_host(host);
@@ -1224,6 +1232,7 @@
.suspend = NULL,
.resume = NULL,
.power_restore = mmc_power_restore,
+ .alive = mmc_alive,
};
static const struct mmc_bus_ops mmc_ops_unsafe = {
@@ -1234,6 +1243,7 @@
.suspend = mmc_suspend,
.resume = mmc_resume,
.power_restore = mmc_power_restore,
+ .alive = mmc_alive,
};
static void mmc_attach_bus_ops(struct mmc_host *host)
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 85b858f..6f27d35 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1019,6 +1019,14 @@
}
/*
+ * Card detection - card is alive.
+ */
+static int mmc_sd_alive(struct mmc_host *host)
+{
+ return mmc_send_status(host->card, NULL);
+}
+
+/*
* Card detection callback from host.
*/
static void mmc_sd_detect(struct mmc_host *host)
@@ -1033,7 +1041,7 @@
/*
* Just check if our card has been removed.
*/
- err = mmc_send_status(host->card, NULL);
+ err = _mmc_detect_card_removed(host);
mmc_release_host(host);
@@ -1102,6 +1110,7 @@
.suspend = NULL,
.resume = NULL,
.power_restore = mmc_sd_power_restore,
+ .alive = mmc_sd_alive,
};
static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
@@ -1110,6 +1119,7 @@
.suspend = mmc_sd_suspend,
.resume = mmc_sd_resume,
.power_restore = mmc_sd_power_restore,
+ .alive = mmc_sd_alive,
};
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 8c04f7f..b77f770 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -820,6 +820,14 @@
}
/*
+ * Card detection - card is alive.
+ */
+static int mmc_sdio_alive(struct mmc_host *host)
+{
+ return mmc_select_card(host->card);
+}
+
+/*
* Card detection callback from host.
*/
static void mmc_sdio_detect(struct mmc_host *host)
@@ -841,7 +849,7 @@
/*
* Just check if our card has been removed.
*/
- err = mmc_select_card(host->card);
+ err = _mmc_detect_card_removed(host);
mmc_release_host(host);
@@ -1019,6 +1027,7 @@
.suspend = mmc_sdio_suspend,
.resume = mmc_sdio_resume,
.power_restore = mmc_sdio_power_restore,
+ .alive = mmc_sdio_alive,
};