2 files changed, 11 insertions, 10 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 6f2a282e2b97..105f419d08cb 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -103,7 +103,7 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
                  mmc_hostname(host), mrq->cmd->opcode,
                  mrq->cmd->arg, mrq->cmd->flags);
 
-        WARN_ON(host->card_busy == NULL);
+        WARN_ON(!host->claimed);
 
         mrq->cmd->error = 0;
         mrq->cmd->mrq = mrq;
@@ -157,7 +157,7 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries
 {
         struct mmc_request mrq;
 
-        BUG_ON(host->card_busy == NULL);
+        BUG_ON(!host->claimed);
 
         memset(&mrq, 0, sizeof(struct mmc_request));
 
@@ -195,7 +195,7 @@ int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
 
         int i, err;
 
-        BUG_ON(host->card_busy == NULL);
+        BUG_ON(!host->claimed);
         BUG_ON(retries < 0);
 
         err = MMC_ERR_INVALID;
@@ -320,14 +320,14 @@ int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
         spin_lock_irqsave(&host->lock, flags);
         while (1) {
                 set_current_state(TASK_UNINTERRUPTIBLE);
-                if (host->card_busy == NULL)
+                if (!host->claimed)
                         break;
                 spin_unlock_irqrestore(&host->lock, flags);
                 schedule();
                 spin_lock_irqsave(&host->lock, flags);
         }
         set_current_state(TASK_RUNNING);
-        host->card_busy = card;
+        host->claimed = 1;
         spin_unlock_irqrestore(&host->lock, flags);
         remove_wait_queue(&host->wq, &wait);
 
@@ -353,10 +353,10 @@ void mmc_release_host(struct mmc_host *host)
 {
         unsigned long flags;
 
-        BUG_ON(host->card_busy == NULL);
+        BUG_ON(!host->claimed);
 
         spin_lock_irqsave(&host->lock, flags);
-        host->card_busy = NULL;
+        host->claimed = 0;
         spin_unlock_irqrestore(&host->lock, flags);
 
         wake_up(&host->wq);
@@ -381,7 +381,7 @@ static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
         int err;
         struct mmc_command cmd;
 
-        BUG_ON(host->card_busy == NULL);
+        BUG_ON(!host->claimed);
 
         if (host->card_selected == card)
                 return MMC_ERR_NONE;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c15ae1986b98..dc4c6e395198 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -106,8 +106,9 @@ struct mmc_host {
         struct list_head        cards;          /* devices attached to this host */
 
         wait_queue_head_t       wq;
-        spinlock_t              lock;           /* card_busy lock */
-        struct mmc_card         *card_busy;     /* the MMC card claiming host */
+        spinlock_t              lock;           /* claimed lock */
+        unsigned int            claimed:1;      /* host exclusively claimed */
+
         struct mmc_card         *card_selected; /* the selected MMC card */
 
         struct delayed_work     detect;