Merge branch 'kvm-arm/vgic-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / drivers / mtd / cmdlinepart.c

diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c
index c533f27d863f3cc44f11c212a2f326c38df7fc57..721caebbc5cc21344a58a710d466205f75f845ef 100644 (file)
--- a/drivers/mtd/cmdlinepart.c
+++ b/drivers/mtd/cmdlinepart.c
@@ -22,11 +22,22 @@
  *
  * mtdparts=<mtddef>[;<mtddef]
  * <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
- *              where <mtd-id> is the name from the "cat /proc/mtd" command
- * <partdef> := <size>[@offset][<name>][ro][lk]
+ * <partdef> := <size>[@<offset>][<name>][ro][lk]
  * <mtd-id>  := unique name used in mapping driver/device (mtd->name)
  * <size>    := standard linux memsize OR "-" to denote all remaining space
+ *              size is automatically truncated at end of device
+ *              if specified or trucated size is 0 the part is skipped
+ * <offset>  := standard linux memsize
+ *              if omitted the part will immediately follow the previous part
+ *              or 0 if the first part
  * <name>    := '(' NAME ')'
+ *              NAME will appear in /proc/mtd
+ *
+ * <size> and <offset> can be specified such that the parts are out of order
+ * in physical memory and may even overlap.
+ *
+ * The parts are assigned MTD numbers in the order they are specified in the
+ * command line regardless of their order in physical memory.
  *
  * Examples:
  *
@@ -70,6 +81,7 @@ struct cmdline_mtd_partition {
 static struct cmdline_mtd_partition *partitions;
 
 /* the command line passed to mtdpart_setup() */
+static char *mtdparts;
 static char *cmdline;
 static int cmdline_parsed;
 
@@ -330,6 +342,14 @@ static int parse_cmdline_partitions(struct mtd_info *master,
                if (part->parts[i].size == SIZE_REMAINING)
                        part->parts[i].size = master->size - offset;
 
+               if (offset + part->parts[i].size > master->size) {
+                       printk(KERN_WARNING ERRP
+                              "%s: partitioning exceeds flash size, truncating\n",
+                              part->mtd_id);
+                       part->parts[i].size = master->size - offset;
+               }
+               offset += part->parts[i].size;
+
                if (part->parts[i].size == 0) {
                        printk(KERN_WARNING ERRP
                               "%s: skipping zero sized partition\n",
@@ -337,16 +357,8 @@ static int parse_cmdline_partitions(struct mtd_info *master,
                        part->num_parts--;
                        memmove(&part->parts[i], &part->parts[i + 1],
                                sizeof(*part->parts) * (part->num_parts - i));
-                       continue;
-               }
-
-               if (offset + part->parts[i].size > master->size) {
-                       printk(KERN_WARNING ERRP
-                              "%s: partitioning exceeds flash size, truncating\n",
-                              part->mtd_id);
-                       part->parts[i].size = master->size - offset;
+                       i--;
                }
-               offset += part->parts[i].size;
        }
 
        *pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
@@ -365,7 +377,7 @@ static int parse_cmdline_partitions(struct mtd_info *master,
  *
  * This function needs to be visible for bootloaders.
  */
-static int mtdpart_setup(char *s)
+static int __init mtdpart_setup(char *s)
 {
        cmdline = s;
        return 1;
@@ -381,10 +393,21 @@ static struct mtd_part_parser cmdline_parser = {
 
 static int __init cmdline_parser_init(void)
 {
+       if (mtdparts)
+               mtdpart_setup(mtdparts);
        return register_mtd_parser(&cmdline_parser);
 }
 
+static void __exit cmdline_parser_exit(void)
+{
+       deregister_mtd_parser(&cmdline_parser);
+}
+
 module_init(cmdline_parser_init);
+module_exit(cmdline_parser_exit);
+
+MODULE_PARM_DESC(mtdparts, "Partitioning specification");
+module_param(mtdparts, charp, 0);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");