sdhci: handle hot-remove

Gracefully handle when the device is suddenly removed. Do a test read
and avoid any further access if that read returns -1.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 7ce12f3e7452..7c302515a6a5 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -198,6 +198,7 @@ struct sdhci_host {
         int                     flags;          /* Host attributes */
 #define SDHCI_USE_DMA           (1<<0)          /* Host is DMA capable */
 #define SDHCI_REQ_USE_DMA       (1<<1)          /* Use DMA for this req. */
+#define SDHCI_DEVICE_DEAD       (1<<2)          /* Device unresponsive */
 
         unsigned int            max_clk;        /* Max possible freq (MHz) */
         unsigned int            timeout_clk;    /* Timeout freq (KHz) */
@@ -239,7 +240,7 @@ static inline void *sdhci_priv(struct sdhci_host *host)
 }
 
 extern int sdhci_add_host(struct sdhci_host *host);
-extern void sdhci_remove_host(struct sdhci_host *host);
+extern void sdhci_remove_host(struct sdhci_host *host, int dead);
 
 #ifdef CONFIG_PM
 extern int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state);