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>

3 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 534974c3ef0c..6402d9224d6a 100644
--- 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 174a844a5dda..87a976cc5654 100644
--- 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 706f72279a17..9a03d0335745 100644
--- 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 */