diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 9d29bed820a1eef5da7b2238cc9a3701ac6da18a..3bebd3b55dc59af53545c9a42d877e8229ae0642 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -202,7 +202,7 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries
 {
 	struct mmc_request mrq;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
 
@@ -333,7 +333,7 @@ void mmc_release_host(struct mmc_host *host)
 {
 	unsigned long flags;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	spin_lock_irqsave(&host->lock, flags);
 	host->claimed = 0;
@@ -531,7 +531,7 @@ void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
 	BUG_ON(!host);
 	BUG_ON(!ops);
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	spin_lock_irqsave(&host->lock, flags);
 
@@ -555,8 +555,8 @@ void mmc_detach_bus(struct mmc_host *host)
 
 	BUG_ON(!host);
 
-	BUG_ON(!host->claimed);
-	BUG_ON(!host->bus_ops);
+	WARN_ON(!host->claimed);
+	WARN_ON(!host->bus_ops);
 
 	spin_lock_irqsave(&host->lock, flags);
 
@@ -584,7 +584,7 @@ void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 #ifdef CONFIG_MMC_DEBUG
 	unsigned long flags;
 	spin_lock_irqsave(&host->lock, flags);
-	BUG_ON(host->removed);
+	WARN_ON(host->removed);
 	spin_unlock_irqrestore(&host->lock, flags);
 #endif
 
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index ba7a847cfd086e46ef95f3c75770f2b8858176a9..6ba458951d24735c8214ae88c53630730a410afe 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -264,7 +264,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	unsigned int max_dtr;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	/*
 	 * Since we're changing the OCR value, we seem to
@@ -558,7 +558,7 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	int err;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_ops);
 
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 0a04a6e86ca11dee51073bcb6432642c730cb825..c86588fdaae5d14e5ecf43d42c99ae0ddf5469a8 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -166,8 +166,6 @@ static int mmc_decode_scr(struct mmc_card *card)
 	unsigned int scr_struct;
 	u32 resp[4];
 
-	BUG_ON(!mmc_card_sd(card));
-
 	resp[3] = card->raw_scr[1];
 	resp[2] = card->raw_scr[0];
 
@@ -300,7 +298,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	unsigned int max_dtr;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	/*
 	 * Since we're changing the OCR value, we seem to
@@ -620,7 +618,7 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	int err;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_sd_ops);
 
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 58cf36e44678908463fc5490f45ed854035b95f9..2f3fb994c383fa99e2c2284a1491ff9765da88a0 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -230,7 +230,7 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
 	struct mmc_card *card;
 
 	BUG_ON(!host);
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_sdio_ops);
 
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index 01daee934d16c270887bdbb097d8911b17ae832d..8843a4c2fe91997f1a0851796b1dc90dfff9be32 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c
@@ -125,7 +125,7 @@ static int sdio_card_irq_get(struct mmc_card *card)
 {
 	struct mmc_host *host = card->host;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 
 	if (!host->sdio_irqs++) {
 		atomic_set(&host->sdio_irq_thread_abort, 0);
@@ -145,7 +145,7 @@ static int sdio_card_irq_put(struct mmc_card *card)
 {
 	struct mmc_host *host = card->host;
 
-	BUG_ON(!host->claimed);
+	WARN_ON(!host->claimed);
 	BUG_ON(host->sdio_irqs < 1);
 
 	if (!--host->sdio_irqs) {