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>

8 files changed, 33 insertions, 21 deletions

diff --git a/drivers/mtd/afs.c b/drivers/mtd/afs.c
index 302372c08b56..89a02f6f65dc 100644
--- a/drivers/mtd/afs.c
+++ b/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;
diff --git a/drivers/mtd/ar7part.c b/drivers/mtd/ar7part.c
index 6697a1ec72d0..71bfa2efb3ea 100644
--- a/drivers/mtd/ar7part.c
+++ b/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;
diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c
index be0c121f2f1b..1b11f94695e9 100644
--- a/drivers/mtd/cmdlinepart.c
+++ b/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;
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 13267477e4e9..e18639980f7a 100644
--- a/drivers/mtd/mtdcore.c
+++ b/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);
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 2b71ccb00d39..34d582c2bdf3 100644
--- a/drivers/mtd/mtdpart.c
+++ b/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);
diff --git a/drivers/mtd/redboot.c b/drivers/mtd/redboot.c
index 7a87d07cd79f..56e48ea7ff05 100644
--- a/drivers/mtd/redboot.c
+++ b/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_
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index d28a241e7b55..b2b454b45cb5 100644
--- a/include/linux/mtd/mtd.h
+++ b/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);
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 1431cf2609ed..5fdb963a5035 100644
--- a/include/linux/mtd/partitions.h
+++ b/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)