jffs2/mtdparts: Fix problem with usage from JFFS2 and MTDPARTS together

Currently using JFFS2 with MTDPARTS enabled doesn't work. This is because
mtdparts_init() is available in both files, cmd_mtdparts.c and
cmd_jffs2.c. Please note that in the original cmd_jffs2.c file (before
the jffs2/mtdparts command/file split those 2 different versions
already existed. So this is nothing new. The main problem is that the
variables "current_dev" and "current_partnum" are declared in both
files now. This doesn't work.

This patch now changes the names of those variable to more specific
names: "current_mtd_dev" and "current_mtd_partnum". This is because
this patch also changes the declaration from static to global, so
that they can be used from both files.

Please note that my first tests were not successful. The MTD devices
selected via mtdparts are now accessed but I'm failing to see the
directory listed via the "ls" command. Nothing is displayed. Perhaps
I didn't generate the JFFS2 image correctly (I never used JFFS2 in
U-Boot before). Not sure. Perhaps somebody else could take a look at
this as well. I'll continue looking into this on Monday.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Ilya Yanok <yanok@emcraft.com>
Cc: Renaud barbier <renaud.barbier@ge.com>

common/cmd_jffs2.c

@@ -137,8 +137,15 @@
 #define MTD_WRITEABLE_CMD		1
 
 /* current active device and partition number */
-static struct mtd_device *current_dev = NULL;
-static u8 current_partnum = 0;
+#ifdef CONFIG_CMD_MTDPARTS
+/* Use the ones declared in cmd_mtdparts.c */
+extern struct mtd_device *current_mtd_dev;
+extern u8 current_mtd_partnum;
+#else
+/* Use local ones */
+struct mtd_device *current_mtd_dev = NULL;
+u8 current_mtd_partnum = 0;
+#endif
 
 #if defined(CONFIG_CMD_CRAMFS)
 extern int cramfs_check (struct part_info *info);
@@ -346,6 +353,9 @@ static inline u32 get_part_sector_size(struct mtdids *id, struct part_info *part
  * Parse and initialize global mtdids mapping and create global
  * device/partition list.
  *
+ * 'Static' version of command line mtdparts_init() routine. Single partition on
+ * a single device configuration.
+ *
  * @return 0 on success, 1 otherwise
  */
 int mtdparts_init(void)
@@ -360,18 +370,18 @@ int mtdparts_init(void)
 		struct part_info *part;
 
 		initialized = 1;
-		current_dev = (struct mtd_device *)
+		current_mtd_dev = (struct mtd_device *)
 			malloc(sizeof(struct mtd_device) +
 					sizeof(struct part_info) +
 					sizeof(struct mtdids));
-		if (!current_dev) {
+		if (!current_mtd_dev) {
 			printf("out of memory\n");
 			return 1;
 		}
-		memset(current_dev, 0, sizeof(struct mtd_device) +
-					sizeof(struct part_info) + sizeof(struct mtdids));
+		memset(current_mtd_dev, 0, sizeof(struct mtd_device) +
+		       sizeof(struct part_info) + sizeof(struct mtdids));
 
-		id = (struct mtdids *)(current_dev + 1);
+		id = (struct mtdids *)(current_mtd_dev + 1);
 		part = (struct part_info *)(id + 1);
 
 		/* id */
@@ -386,7 +396,7 @@ int mtdparts_init(void)
 		if ((mtd_id_parse(dev_name, NULL, &id->type, &id->num) != 0) ||
 				(mtd_device_validate(id->type, id->num, &size) != 0)) {
 			printf("incorrect device: %s%d\n", MTD_DEV_TYPE(id->type), id->num);
-			free(current_dev);
+			free(current_mtd_dev);
 			return 1;
 		}
 		id->size = size;
@@ -413,7 +423,7 @@ int mtdparts_init(void)
 
 		part->sector_size = get_part_sector_size(id, part);
 
-		part->dev = current_dev;
+		part->dev = current_mtd_dev;
 		INIT_LIST_HEAD(&part->link);
 
 		/* recalculate size if needed */
@@ -424,11 +434,11 @@ int mtdparts_init(void)
 				part->name, part->size, part->offset);
 
 		/* device */
-		current_dev->id = id;
-		INIT_LIST_HEAD(&current_dev->link);
-		current_dev->num_parts = 1;
-		INIT_LIST_HEAD(&current_dev->parts);
-		list_add(&part->link, &current_dev->parts);
+		current_mtd_dev->id = id;
+		INIT_LIST_HEAD(&current_mtd_dev->link);
+		current_mtd_dev->num_parts = 1;
+		INIT_LIST_HEAD(&current_mtd_dev->parts);
+		list_add(&part->link, &current_mtd_dev->parts);
 	}
 
 	return 0;
@@ -516,7 +526,7 @@ int do_jffs2_fsload(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	if (mtdparts_init() !=0)
 		return 1;
 
-	if ((part = jffs2_part_info(current_dev, current_partnum))){
+	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){
 
 		/* check partition type for cramfs */
 		fsname = (cramfs_check(part) ? "CRAMFS" : "JFFS2");
@@ -567,7 +577,7 @@ int do_jffs2_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	if (mtdparts_init() !=0)
 		return 1;
 
-	if ((part = jffs2_part_info(current_dev, current_partnum))){
+	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){
 
 		/* check partition type for cramfs */
 		if (cramfs_check(part)) {
@@ -602,7 +612,7 @@ int do_jffs2_fsinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	if (mtdparts_init() !=0)
 		return 1;
 
-	if ((part = jffs2_part_info(current_dev, current_partnum))){
+	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){
 
 		/* check partition type for cramfs */
 		fsname = (cramfs_check(part) ? "CRAMFS" : "JFFS2");

common/cmd_mtdparts.c

@@ -166,8 +166,8 @@ struct list_head mtdids;
 struct list_head devices;
 
 /* current active device and partition number */
-static struct mtd_device *current_dev = NULL;
-static u8 current_partnum = 0;
+struct mtd_device *current_mtd_dev = NULL;
+u8 current_mtd_partnum = 0;
 
 static struct part_info* mtd_part_info(struct mtd_device *dev, unsigned int part_num);
 
@@ -251,12 +251,12 @@ static void index_partitions(void)
 
 	DEBUGF("--- index partitions ---\n");
 
-	if (current_dev) {
+	if (current_mtd_dev) {
 		mtddevnum = 0;
 		list_for_each(dentry, &devices) {
 			dev = list_entry(dentry, struct mtd_device, link);
-			if (dev == current_dev) {
-				mtddevnum += current_partnum;
+			if (dev == current_mtd_dev) {
+				mtddevnum += current_mtd_partnum;
 				sprintf(buf, "%d", mtddevnum);
 				setenv("mtddevnum", buf);
 				break;
@@ -264,7 +264,7 @@ static void index_partitions(void)
 			mtddevnum += dev->num_parts;
 		}
 
-		part = mtd_part_info(current_dev, current_partnum);
+		part = mtd_part_info(current_mtd_dev, current_mtd_partnum);
 		setenv("mtddevname", part->name);
 
 		DEBUGF("=> mtddevnum %d,\n=> mtddevname %s\n", mtddevnum, part->name);
@@ -285,9 +285,9 @@ static void current_save(void)
 
 	DEBUGF("--- current_save ---\n");
 
-	if (current_dev) {
-		sprintf(buf, "%s%d,%d", MTD_DEV_TYPE(current_dev->id->type),
-					current_dev->id->num, current_partnum);
+	if (current_mtd_dev) {
+		sprintf(buf, "%s%d,%d", MTD_DEV_TYPE(current_mtd_dev->id->type),
+					current_mtd_dev->id->num, current_mtd_partnum);
 
 		setenv("partition", buf);
 		strncpy(last_partition, buf, 16);
@@ -498,18 +498,18 @@ static int part_del(struct mtd_device *dev, struct part_info *part)
 
 	/* otherwise just delete this partition */
 
-	if (dev == current_dev) {
+	if (dev == current_mtd_dev) {
 		/* we are modyfing partitions for the current device,
 		 * update current */
 		struct part_info *curr_pi;
-		curr_pi = mtd_part_info(current_dev, current_partnum);
+		curr_pi = mtd_part_info(current_mtd_dev, current_mtd_partnum);
 
 		if (curr_pi) {
 			if (curr_pi == part) {
 				printf("current partition deleted, resetting current to 0\n");
-				current_partnum = 0;
+				current_mtd_partnum = 0;
 			} else if (part->offset <= curr_pi->offset) {
-				current_partnum--;
+				current_mtd_partnum--;
 			}
 			current_save_needed = 1;
 		}
@@ -579,8 +579,8 @@ static int part_sort_add(struct mtd_device *dev, struct part_info *part)
 
 	/* get current partition info if we are updating current device */
 	curr_pi = NULL;
-	if (dev == current_dev)
-		curr_pi = mtd_part_info(current_dev, current_partnum);
+	if (dev == current_mtd_dev)
+		curr_pi = mtd_part_info(current_mtd_dev, current_mtd_partnum);
 
 	list_for_each(entry, &dev->parts) {
 		struct part_info *pi;
@@ -600,7 +600,7 @@ static int part_sort_add(struct mtd_device *dev, struct part_info *part)
 			if (curr_pi && (pi->offset <= curr_pi->offset)) {
 				/* we are modyfing partitions for the current
 				 * device, update current */
-				current_partnum++;
+				current_mtd_partnum++;
 				current_save();
 			} else {
 				index_partitions();
@@ -842,15 +842,15 @@ static int device_del(struct mtd_device *dev)
 	list_del(&dev->link);
 	free(dev);
 
-	if (dev == current_dev) {
+	if (dev == current_mtd_dev) {
 		/* we just deleted current device */
 		if (list_empty(&devices)) {
-			current_dev = NULL;
+			current_mtd_dev = NULL;
 		} else {
 			/* reset first partition from first dev from the
 			 * devices list as current */
-			current_dev = list_entry(devices.next, struct mtd_device, link);
-			current_partnum = 0;
+			current_mtd_dev = list_entry(devices.next, struct mtd_device, link);
+			current_mtd_partnum = 0;
 		}
 		current_save();
 		return 0;
@@ -893,8 +893,8 @@ static void device_add(struct mtd_device *dev)
 	u8 current_save_needed = 0;
 
 	if (list_empty(&devices)) {
-		current_dev = dev;
-		current_partnum = 0;
+		current_mtd_dev = dev;
+		current_mtd_partnum = 0;
 		current_save_needed = 1;
 	}
 
@@ -1050,7 +1050,7 @@ static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_
 static int mtd_devices_init(void)
 {
 	last_parts[0] = '\0';
-	current_dev = NULL;
+	current_mtd_dev = NULL;
 	current_save();
 
 	return device_delall(&devices);
@@ -1330,13 +1330,13 @@ static void list_partitions(void)
 	if (list_empty(&devices))
 		printf("no partitions defined\n");
 
-	/* current_dev is not NULL only when we have non empty device list */
-	if (current_dev) {
-		part = mtd_part_info(current_dev, current_partnum);
+	/* current_mtd_dev is not NULL only when we have non empty device list */
+	if (current_mtd_dev) {
+		part = mtd_part_info(current_mtd_dev, current_mtd_partnum);
 		if (part) {
 			printf("\nactive partition: %s%d,%d - (%s) 0x%08x @ 0x%08x\n",
-					MTD_DEV_TYPE(current_dev->id->type),
-					current_dev->id->num, current_partnum,
+					MTD_DEV_TYPE(current_mtd_dev->id->type),
+					current_mtd_dev->id->num, current_mtd_partnum,
 					part->name, part->size, part->offset);
 		} else {
 			printf("could not get current partition info\n\n");
@@ -1709,13 +1709,13 @@ int mtdparts_init(void)
 		strncpy(last_parts, parts, MTDPARTS_MAXLEN);
 
 		/* reset first partition from first dev from the list as current */
-		current_dev = list_entry(devices.next, struct mtd_device, link);
-		current_partnum = 0;
+		current_mtd_dev = list_entry(devices.next, struct mtd_device, link);
+		current_mtd_partnum = 0;
 		current_save();
 
-		DEBUGF("mtdparts_init: current_dev  = %s%d, current_partnum = %d\n",
-				MTD_DEV_TYPE(current_dev->id->type),
-				current_dev->id->num, current_partnum);
+		DEBUGF("mtdparts_init: current_mtd_dev  = %s%d, current_mtd_partnum = %d\n",
+				MTD_DEV_TYPE(current_mtd_dev->id->type),
+				current_mtd_dev->id->num, current_mtd_partnum);
 	}
 
 	/* mtdparts variable was reset to NULL, delete all devices/partitions */
@@ -1735,8 +1735,8 @@ int mtdparts_init(void)
 		DEBUGF("--- getting current partition: %s\n", tmp_ep);
 
 		if (find_dev_and_part(tmp_ep, &cdev, &pnum, &p) == 0) {
-			current_dev = cdev;
-			current_partnum = pnum;
+			current_mtd_dev = cdev;
+			current_mtd_partnum = pnum;
 			current_save();
 		}
 	} else if (getenv("partition") == NULL) {
@@ -1820,8 +1820,8 @@ int do_chpart(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	if (find_dev_and_part(argv[1], &dev, &pnum, &part) != 0)
 		return 1;
 
-	current_dev = dev;
-	current_partnum = pnum;
+	current_mtd_dev = dev;
+	current_mtd_partnum = pnum;
 	current_save();
 
 	printf("partition changed to %s%d,%d\n",