optimize the performance of the minstrel rate algorithm - don't sample lower rates...

[openwrt.git] / target / linux / ar7-2.6 / files / drivers / mtd / ar7part.c

diff --git a/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c b/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c
index 2b3edf6..587bb31 100644 (file)
--- a/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c
+++ b/target/linux/ar7-2.6/files/drivers/mtd/ar7part.c
@@ -42,83 +42,84 @@ static int create_mtd_partitions(struct mtd_info *master,
                                 struct mtd_partition **pparts, 
                                 unsigned long origin)
 {
-       char sig[8];
        struct ar7_bin_rec header;
-       unsigned int offset, new_offset, len;
-       struct squashfs_super_block sb;
-       unsigned int block_size = 0x10000, pre_size = 0x10000,
-               post_size = 0, root_offset = 0xe0000; 
-       unsigned int p = 3;
+       unsigned int offset, len;
+       unsigned int pre_size = master->erasesize, post_size = 0,
+               root_offset = 0xe0000;
+       int retries = 10;
 
        printk("Parsing AR7 partition map...\n");
 
        ar7_parts[0].name = "loader";
        ar7_parts[0].offset = 0;
-       ar7_parts[0].size = block_size;
+       ar7_parts[0].size = master->erasesize;
        ar7_parts[0].mask_flags = MTD_WRITEABLE;
 
        ar7_parts[1].name = "config";
-       ar7_parts[1].size = block_size;
+       ar7_parts[1].offset = 0;
+       ar7_parts[1].size = master->erasesize;
        ar7_parts[1].mask_flags = 0;
 
-       master->read(master, block_size, 8, &len, sig);
-       if (strncmp(sig, "TIENV0.8", 8)) {
-               ar7_parts[1].offset = master->size - block_size;
-               post_size = block_size;
-       } else {
-               ar7_parts[1].offset = block_size;
-               pre_size = block_size * 2;
+       do {
+               offset = pre_size;
+               master->read(master, offset, sizeof(header), &len, (u_char *)&header);
+               if (!strncmp((char *)&header, "TIENV0.8", 8))
+                       ar7_parts[1].offset = pre_size;
+               if (header.checksum == 0xfeedfa42)
+                       break;
+               if (header.checksum == 0xfeed1281)
+                       break;
+               pre_size += master->erasesize;
+       } while (retries--);
+
+       pre_size = offset;
+
+       if (!ar7_parts[1].offset) {
+               ar7_parts[1].offset = master->size - master->erasesize;
+               post_size = master->erasesize;
        }
 
-       ar7_parts[2].name = "linux";
-       ar7_parts[2].offset = pre_size;
-       ar7_parts[2].size = master->size - block_size * 2;
-       ar7_parts[2].mask_flags = 0;
-
-       offset = pre_size;
-       master->read(master, offset, sizeof(header), &len, (u_char *)&header);
-       if (header.checksum != 0xfeedfa42) {
-               printk("Unknown magic: %08x\n", header.checksum);
-       } else {
+       switch (header.checksum) {
+       case 0xfeedfa42:
                while (header.length) {
                        offset += sizeof(header) + header.length;
                        master->read(master, offset, sizeof(header),
                                     &len, (u_char *)&header); 
                }
                root_offset = offset + sizeof(header) + 4;
+               break;
+       case 0xfeed1281:
+               while (header.length) {
+                       offset += sizeof(header) + header.length;
+                       master->read(master, offset, sizeof(header),
+                                    &len, (u_char *)&header); 
+               }
+               root_offset = offset + sizeof(header) + 4 + 0xff;
+               root_offset &= ~(u32)0xff;
+               break;
+       default:
+               printk("Unknown magic: %08x\n", header.checksum);
+               break;
        }
-       
-       ar7_parts[p].name = "rootfs";
-       ar7_parts[p].offset = root_offset;
-       ar7_parts[p].size = master->size - root_offset - post_size;
-       ar7_parts[p++].mask_flags = 0;
-
-       master->read(master, root_offset, sizeof(sb), &len, (u_char *)&sb);
-       if (sb.s_magic == SQUASHFS_MAGIC) {
-               printk("Squashfs detected (size %Ld)\n", sb.bytes_used);
-               new_offset = root_offset + sb.bytes_used;
-
-               if ((new_offset % master->erasesize) > 0)
-                       new_offset += master->erasesize - 
-                               (new_offset % master->erasesize); 
-
-               ar7_parts[p].name = "rootfs_data";
-               ar7_parts[p].offset = new_offset;
-               ar7_parts[p].size = master->size - new_offset - post_size;
-               ar7_parts[p - 1].size -= ar7_parts[p].size;
-               ar7_parts[p - 1].mask_flags |= MTD_WRITEABLE;
-               ar7_parts[p++].mask_flags = 0;
-       } else {
-               printk("Squashfs not found. Moving rootfs partition to next erase block\n");
-               if ((root_offset % master->erasesize) > 0) 
-                       root_offset += master->erasesize - 
-                               (root_offset % master->erasesize); 
-
-               ar7_parts[p].offset = root_offset;
-               ar7_parts[p].size = master->size - root_offset - post_size;
+
+       master->read(master, root_offset, sizeof(header), &len, (u_char *)&header);
+       if (header.checksum != SQUASHFS_MAGIC) {
+               root_offset += master->erasesize - 1;
+               root_offset &= ~(master->erasesize - 1);
        }
+
+       ar7_parts[2].name = "linux";
+       ar7_parts[2].offset = pre_size;
+       ar7_parts[2].size = master->size - pre_size - post_size;
+       ar7_parts[2].mask_flags = 0;
+
+       ar7_parts[3].name = "rootfs";
+       ar7_parts[3].offset = root_offset;
+       ar7_parts[3].size = master->size - root_offset - post_size;
+       ar7_parts[3].mask_flags = 0;
+
        *pparts = ar7_parts;
-       return p;
+       return 4;
 }
 
 static struct mtd_part_parser ar7_parser = {