From 4188ba3202172863d6034adfcac805e8bccf186a Mon Sep 17 00:00:00 2001
From: Nikita Kiryanov <nikita@compulab.co.il>
Date: Sun, 8 Nov 2015 17:11:44 +0200
Subject: [PATCH] spl: mmc: refactor device location code to its own function

Simplify spl_mmc_load_image() code by moving the part that finds the mmc device
into its own function spl_mmc_find_device(), available in two flavors: DM and
non-DM.

This refactor fixes a bug in which an error in the device location sequence
does not necessarily aborts the rest of the code. With this refactor, we fail
the moment there is an error.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Paul Kocialkowski <contact@paulk.fr>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
 common/spl/spl_mmc.c | 77 +++++++++++++++++++++++++++++++-------------
 1 file changed, 55 insertions(+), 22 deletions(-)

diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index 6011f778d2..9d3c09ed3f 100644
--- a/common/spl/spl_mmc.c
+++ b/common/spl/spl_mmc.c
@@ -11,6 +11,7 @@
 #include <spl.h>
 #include <linux/compiler.h>
 #include <asm/u-boot.h>
+#include <errno.h>
 #include <mmc.h>
 #include <image.h>
 
@@ -59,6 +60,58 @@ end:
 	return 0;
 }
 
+#ifdef CONFIG_DM_MMC
+static int spl_mmc_find_device(struct mmc **mmc)
+{
+	struct udevice *dev;
+	int err;
+
+	err = mmc_initialize(NULL);
+	if (err) {
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
+		printf("spl: could not initialize mmc. error: %d\n", err);
+#endif
+		return err;
+	}
+
+	err = uclass_get_device(UCLASS_MMC, 0, &dev);
+	if (err) {
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
+		printf("spl: could not find mmc device. error: %d\n", err);
+#endif
+		return err;
+	}
+
+	*mmc = NULL;
+	*mmc = mmc_get_mmc_dev(dev);
+	return *mmc != NULL ? 0 : -ENODEV;
+}
+#else
+static int spl_mmc_find_device(struct mmc **mmc)
+{
+	int err;
+
+	err = mmc_initialize(gd->bd);
+	if (err) {
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
+		printf("spl: could not initialize mmc. error: %d\n", err);
+#endif
+		return err;
+	}
+
+	/* We register only one device. So, the dev id is always 0 */
+	*mmc = find_mmc_device(0);
+	if (!*mmc) {
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
+		puts("spl: mmc device not found\n");
+#endif
+		return -ENODEV;
+	}
+
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
 static int mmc_load_image_raw_partition(struct mmc *mmc, int partition)
 {
@@ -110,30 +163,10 @@ void spl_mmc_load_image(void)
 	int err = 0;
 	__maybe_unused int part;
 
-#ifdef CONFIG_DM_MMC
-	struct udevice *dev;
-
-	mmc_initialize(NULL);
-	err = uclass_get_device(UCLASS_MMC, 0, &dev);
-	mmc = NULL;
-	if (!err)
-		mmc = mmc_get_mmc_dev(dev);
-#else
-	mmc_initialize(gd->bd);
-
-	/* We register only one device. So, the dev id is always 0 */
-	mmc = find_mmc_device(0);
-	if (!mmc) {
-#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
-		puts("spl: mmc device not found\n");
-#endif
+	if (spl_mmc_find_device(&mmc))
 		hang();
-	}
-#endif
-
-	if (!err)
-		err = mmc_init(mmc);
 
+	err = mmc_init(mmc);
 	if (err) {
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 		printf("spl: mmc init failed with error: %d\n", err);