mtd: abstract last MTD partition parser argument

Encapsulate last MTD partition parser argument into a separate
structure. Currently it holds only 'origin' field for RedBoot parser,
but will be extended in future to contain at least device_node for OF
devices.

Amended commentary to make kerneldoc happy

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Artem Bityutskiy <dedekind1@gmail.com>

drivers/mtd/afs.c

@@ -162,8 +162,8 @@ afs_read_iis(struct mtd_info *mtd, struct image_info_struct *iis, u_int ptr)
 }
 
 static int parse_afs_partitions(struct mtd_info *mtd,
-                         struct mtd_partition **pparts,
-                         unsigned long origin)
+				struct mtd_partition **pparts,
+				struct mtd_part_parser_data *data)
 {
 	struct mtd_partition *parts;
 	u_int mask, off, idx, sz;

drivers/mtd/ar7part.c

@@ -46,7 +46,7 @@ struct ar7_bin_rec {
 
 static int create_mtd_partitions(struct mtd_info *master,
 				 struct mtd_partition **pparts,
-				 unsigned long origin)
+				 struct mtd_part_parser_data *data)
 {
 	struct ar7_bin_rec header;
 	unsigned int offset;

drivers/mtd/cmdlinepart.c

@@ -313,8 +313,8 @@ static int mtdpart_setup_real(char *s)
  * the first one in the chain if a NULL mtd_id is passed in.
  */
 static int parse_cmdline_partitions(struct mtd_info *master,
-                             struct mtd_partition **pparts,
-                             unsigned long origin)
+				    struct mtd_partition **pparts,
+				    struct mtd_part_parser_data *data)
 {
 	unsigned long offset;
 	int i;

drivers/mtd/mtdcore.c

@@ -457,7 +457,7 @@ EXPORT_SYMBOL_GPL(mtd_device_register);
  * @mtd: the MTD device to register
  * @types: the list of MTD partition probes to try, see
  *         'parse_mtd_partitions()' for more information
- * @origin: start address of MTD device, %0 unless you are sure you need this.
+ * @parser_data: MTD partition parser-specific data
  * @parts: fallback partition information to register, if parsing fails;
  *         only valid if %nr_parts > %0
  * @nr_parts: the number of partitions in parts, if zero then the full
@@ -480,14 +480,14 @@ EXPORT_SYMBOL_GPL(mtd_device_register);
  * Returns zero in case of success and a negative error code in case of failure.
  */
 int mtd_device_parse_register(struct mtd_info *mtd, const char **types,
-			      unsigned long origin,
+			      struct mtd_part_parser_data *parser_data,
 			      const struct mtd_partition *parts,
 			      int nr_parts)
 {
 	int err;
 	struct mtd_partition *real_parts;
 
-	err = parse_mtd_partitions(mtd, types, &real_parts, origin);
+	err = parse_mtd_partitions(mtd, types, &real_parts, parser_data);
 	if (err <= 0 && nr_parts) {
 		real_parts = kmemdup(parts, sizeof(*parts) * nr_parts,
 				     GFP_KERNEL);

drivers/mtd/mtdpart.c

@@ -736,7 +736,7 @@ static const char *default_mtd_part_types[] = {"cmdlinepart", NULL};
  * @master: the master partition (describes whole MTD device)
  * @types: names of partition parsers to try or %NULL
  * @pparts: array of partitions found is returned here
- * @origin: MTD device start address (use %0 if unsure)
+ * @data: MTD partition parser-specific data
  *
  * This function tries to find partition on MTD device @master. It uses MTD
  * partition parsers, specified in @types. However, if @types is %NULL, then
@@ -750,7 +750,8 @@ static const char *default_mtd_part_types[] = {"cmdlinepart", NULL};
  *   point to an array containing this number of &struct mtd_info objects.
  */
 int parse_mtd_partitions(struct mtd_info *master, const char **types,
-			 struct mtd_partition **pparts, unsigned long origin)
+			 struct mtd_partition **pparts,
+			 struct mtd_part_parser_data *data)
 {
 	struct mtd_part_parser *parser;
 	int ret = 0;
@@ -764,7 +765,7 @@ int parse_mtd_partitions(struct mtd_info *master, const char **types,
 				parser = get_partition_parser(*types);
 		if (!parser)
 			continue;
-		ret = (*parser->parse_fn)(master, pparts, origin);
+		ret = (*parser->parse_fn)(master, pparts, data);
 		if (ret > 0) {
 			printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
 			       ret, parser->name, master->name);

drivers/mtd/redboot.c

@@ -56,8 +56,8 @@ static inline int redboot_checksum(struct fis_image_desc *img)
 }
 
 static int parse_redboot_partitions(struct mtd_info *master,
-                             struct mtd_partition **pparts,
-                             unsigned long fis_origin)
+				    struct mtd_partition **pparts,
+				    struct mtd_part_parser_data *data)
 {
 	int nrparts = 0;
 	struct fis_image_desc *buf;
@@ -197,11 +197,10 @@ static int parse_redboot_partitions(struct mtd_info *master,
 			goto out;
 		}
 		new_fl->img = &buf[i];
-                if (fis_origin) {
-                        buf[i].flash_base -= fis_origin;
-                } else {
-                        buf[i].flash_base &= master->size-1;
-                }
+		if (data && data->origin)
+			buf[i].flash_base -= data->origin;
+		else
+			buf[i].flash_base &= master->size-1;
 
 		/* I'm sure the JFFS2 code has done me permanent damage.
 		 * I now think the following is _normal_

include/linux/mtd/mtd.h

@@ -323,13 +323,14 @@ static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
 	/* Kernel-side ioctl definitions */
 
 struct mtd_partition;
+struct mtd_part_parser_data;
 
 extern int mtd_device_register(struct mtd_info *master,
 			       const struct mtd_partition *parts,
 			       int nr_parts);
 extern int mtd_device_parse_register(struct mtd_info *mtd,
 			      const char **part_probe_types,
-			      unsigned long origin,
+			      struct mtd_part_parser_data *parser_data,
 			      const struct mtd_partition *defparts,
 			      int defnr_parts);
 extern int mtd_device_unregister(struct mtd_info *master);

include/linux/mtd/partitions.h

@@ -52,6 +52,15 @@ struct mtd_partition {
 
 struct mtd_info;
 
+/**
+ * struct mtd_part_parser_data - used to pass data to MTD partition parsers.
+ * @origin: for RedBoot, start address of MTD device
+ */
+struct mtd_part_parser_data {
+	unsigned long origin;
+};
+
+
 /*
  * Functions dealing with the various ways of partitioning the space
  */
@@ -60,13 +69,15 @@ struct mtd_part_parser {
 	struct list_head list;
 	struct module *owner;
 	const char *name;
-	int (*parse_fn)(struct mtd_info *, struct mtd_partition **, unsigned long);
+	int (*parse_fn)(struct mtd_info *, struct mtd_partition **,
+			struct mtd_part_parser_data *);
 };
 
 extern int register_mtd_parser(struct mtd_part_parser *parser);
 extern int deregister_mtd_parser(struct mtd_part_parser *parser);
 extern int parse_mtd_partitions(struct mtd_info *master, const char **types,
-				struct mtd_partition **pparts, unsigned long origin);
+				struct mtd_partition **pparts,
+				struct mtd_part_parser_data *data);
 
 #define put_partition_parser(p) do { module_put((p)->owner); } while(0)