[MMC] Add mmc_hostname() macro

mmc_hostname() returns a pointer to the hostname for the mmc_host.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c
index 7a42966..716c4ef 100644
--- a/drivers/mmc/mmci.c
+++ b/drivers/mmc/mmci.c
@@ -34,7 +34,7 @@
 
 #ifdef CONFIG_MMC_DEBUG
 #define DBG(host,fmt,args...)	\
-	pr_debug("%s: %s: " fmt, host->mmc->host_name, __func__ , args)
+	pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)
 #else
 #define DBG(host,fmt,args...)	do { } while (0)
 #endif
@@ -541,7 +541,7 @@
 	mmc_add_host(mmc);
 
 	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%08lx irq %d,%d\n",
-		mmc->host_name, amba_rev(dev), amba_config(dev),
+		mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
 		dev->res.start, dev->irq[0], dev->irq[1]);
 
 	init_timer(&host->timer);