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 950b97d7412a4f6f5f562401f132ed0d568a969a..a2aa860956efb44085a766d76b9c7c1e98cc7992 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -140,7 +140,7 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
                        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 @@ static void __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
 {
        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 @@ static void mmc_wait_for_req_done(struct mmc_host *host,
                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 @@ void mmc_detect_change(struct mmc_host *host, unsigned long delay)
        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 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
        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 @@ void mmc_rescan(struct work_struct *work)
            && !(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 14664f1fb16fb560c526dd30817cc10ae6db1adf..34009241213c4640aa6ba28aa5d66c63484ec655 100644 (file)
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -24,6 +24,7 @@ struct mmc_bus_ops {
        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_rescan(struct work_struct *work);
 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 a1223bd3d99780ee56aa61a53e49e38b8b3de453..e8b6b5d52fe1ab7482afb8d9fdcbef3f7c095154 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1103,6 +1103,14 @@ static void mmc_remove(struct mmc_host *host)
        host->card = NULL;
 }
 
+/*
+ * 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.
  */
@@ -1118,7 +1126,7 @@ static void mmc_detect(struct mmc_host *host)
        /*
         * 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);
 
@@ -1223,6 +1231,7 @@ static const struct mmc_bus_ops mmc_ops = {
        .suspend = NULL,
        .resume = NULL,
        .power_restore = mmc_power_restore,
+       .alive = mmc_alive,
 };
 
 static const struct mmc_bus_ops mmc_ops_unsafe = {
@@ -1233,6 +1242,7 @@ static const struct mmc_bus_ops mmc_ops_unsafe = {
        .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 1d5a3bd70d2252226d22fae1e3b23d022be92f50..bfdf7085d349712649ff627158e900acbac03577 100644 (file)
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1017,6 +1017,14 @@ static void mmc_sd_remove(struct mmc_host *host)
        host->card = NULL;
 }
 
+/*
+ * 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.
  */
@@ -1032,7 +1040,7 @@ static void mmc_sd_detect(struct mmc_host *host)
        /*
         * 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);
 
@@ -1101,6 +1109,7 @@ static const struct mmc_bus_ops mmc_sd_ops = {
        .suspend = NULL,
        .resume = NULL,
        .power_restore = mmc_sd_power_restore,
+       .alive = mmc_sd_alive,
 };
 
 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
@@ -1109,6 +1118,7 @@ static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
        .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 8c04f7f46dec6dc6dbf988912eaadc4d74934b00..b77f770ce5d17b3ec6ceb77a9f8233977b68d643 100644 (file)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -819,6 +819,14 @@ static void mmc_sdio_remove(struct mmc_host *host)
        host->card = NULL;
 }
 
+/*
+ * 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.
  */
@@ -841,7 +849,7 @@ static void mmc_sdio_detect(struct mmc_host *host)
        /*
         * 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 @@ static const struct mmc_bus_ops mmc_sdio_ops = {
        .suspend = mmc_sdio_suspend,
        .resume = mmc_sdio_resume,
        .power_restore = mmc_sdio_power_restore,
+       .alive = mmc_sdio_alive,
 };
 
 

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 534974c3ef0ce521d5e2950d57a582f991d3c8bd..6402d9224d6a9c6c6bfb8a830c154d138592aa81 100644 (file)
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -209,6 +209,7 @@ struct mmc_card {
 #define MMC_STATE_HIGHSPEED_DDR (1<<4)         /* card is in high speed mode */
 #define MMC_STATE_ULTRAHIGHSPEED (1<<5)                /* card is in ultra high speed mode */
 #define MMC_CARD_SDXC          (1<<6)          /* card is SDXC */
+#define MMC_CARD_REMOVED       (1<<7)          /* card has been removed */
        unsigned int            quirks;         /* card quirks */
 #define MMC_QUIRK_LENIENT_FN0  (1<<0)          /* allow SDIO FN0 writes outside of the VS CCCR range */
 #define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1)   /* use func->cur_blksize */
@@ -370,6 +371,7 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
 #define mmc_card_uhs(c)                ((c)->state & MMC_STATE_ULTRAHIGHSPEED)
 #define mmc_sd_card_uhs(c)     ((c)->state & MMC_STATE_ULTRAHIGHSPEED)
 #define mmc_card_ext_capacity(c) ((c)->state & MMC_CARD_SDXC)
+#define mmc_card_removed(c)    ((c) && ((c)->state & MMC_CARD_REMOVED))
 
 #define mmc_card_set_present(c)        ((c)->state |= MMC_STATE_PRESENT)
 #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
@@ -379,6 +381,7 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
 #define mmc_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
 #define mmc_sd_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
 #define mmc_card_set_ext_capacity(c) ((c)->state |= MMC_CARD_SDXC)
+#define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)
 
 /*
  * Quirk add/remove for MMC products.

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 174a844a5dda67fae26d87514432a0080bf3d7b3..87a976cc5654d164361014849a8733c6733c18e9 100644 (file)
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -180,6 +180,8 @@ extern int mmc_try_claim_host(struct mmc_host *host);
 
 extern int mmc_flush_cache(struct mmc_card *);
 
+extern int mmc_detect_card_removed(struct mmc_host *host);
+
 /**
  *     mmc_claim_host - exclusively claim a host
  *     @host: mmc host to claim

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 706f72279a17a67e210f153110225addc61c6e6e..9a03d03357456c8950ca02ca2f200e32d0e7b00c 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -299,6 +299,7 @@ struct mmc_host {
        int                     claim_cnt;      /* "claim" nesting count */
 
        struct delayed_work     detect;
+       int                     detect_change;  /* card detect flag */
 
        const struct mmc_bus_ops *bus_ops;      /* current bus driver */
        unsigned int            bus_refs;       /* reference counter */