---

yaml
---
r: 53587
b: refs/heads/master
c: 6abaa0c
h: refs/heads/master
i:
  53585: 31a851d
  53583: 30197ba
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 89a73cf52ba2ae4402c53487b71ec4475544f139
+refs/heads/master: 6abaa0c9fec563538f2a28a682af8c89bb9b125c

trunk/drivers/mmc/Kconfig

@@ -19,6 +19,8 @@ config MMC_DEBUG
 	  This is an option for use by developers; most people should
 	  say N here.  This enables MMC core and driver debugging.
 
+source "drivers/mmc/core/Kconfig"
+
 source "drivers/mmc/card/Kconfig"
 
 source "drivers/mmc/host/Kconfig"

trunk/drivers/mmc/core/Kconfig

@@ -0,0 +1,17 @@
+#
+# MMC core configuration
+#
+
+config MMC_UNSAFE_RESUME
+	bool "Allow unsafe resume (DANGEROUS)"
+	depends on MMC != n
+	help
+	  If you say Y here, the MMC layer will assume that all cards
+	  stayed in their respective slots during the suspend. The
+	  normal behaviour is to remove them at suspend and
+	  redetecting them at resume. Breaking this assumption will
+	  in most cases result in data corruption.
+
+	  This option is usually just for embedded systems which use
+	  a MMC/SD card for rootfs. Most people should say N here.
+

trunk/drivers/mmc/core/core.c

@@ -677,14 +677,19 @@ int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
 
 	mmc_bus_get(host);
 	if (host->bus_ops && !host->bus_dead) {
-		if (host->bus_ops->remove)
-			host->bus_ops->remove(host);
-		mmc_detach_bus(host);
+		if (host->bus_ops->suspend)
+			host->bus_ops->suspend(host);
+		if (!host->bus_ops->resume) {
+			if (host->bus_ops->remove)
+				host->bus_ops->remove(host);
+
+			mmc_claim_host(host);
+			mmc_detach_bus(host);
+			mmc_release_host(host);
+		}
 	}
 	mmc_bus_put(host);
 
-	BUG_ON(host->card);
-
 	mmc_power_off(host);
 
 	return 0;
@@ -698,7 +703,19 @@ EXPORT_SYMBOL(mmc_suspend_host);
  */
 int mmc_resume_host(struct mmc_host *host)
 {
-	mmc_rescan(&host->detect.work);
+	mmc_bus_get(host);
+	if (host->bus_ops && !host->bus_dead) {
+		mmc_power_up(host);
+		BUG_ON(!host->bus_ops->resume);
+		host->bus_ops->resume(host);
+	}
+	mmc_bus_put(host);
+
+	/*
+	 * We add a slight delay here so that resume can progress
+	 * in parallel.
+	 */
+	mmc_detect_change(host, 1);
 
 	return 0;
 }

trunk/drivers/mmc/core/core.h

@@ -18,6 +18,8 @@
 struct mmc_bus_ops {
 	void (*remove)(struct mmc_host *);
 	void (*detect)(struct mmc_host *);
+	void (*suspend)(struct mmc_host *);
+	void (*resume)(struct mmc_host *);
 };
 
 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);