diff options
Diffstat (limited to 'package/nvram/src/nvram.c')
| -rw-r--r-- | package/nvram/src/nvram.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/package/nvram/src/nvram.c b/package/nvram/src/nvram.c index 7ab8c81ab..a0bc006d1 100644 --- a/package/nvram/src/nvram.c +++ b/package/nvram/src/nvram.c @@ -142,7 +142,7 @@ static int _nvram_rehash(nvram_handle_t *h) /* Get nvram header. */ nvram_header_t * nvram_header(nvram_handle_t *h) { - return (nvram_header_t *) &h->mmap[NVRAM_START(nvram_erase_size)]; + return (nvram_header_t *) &h->mmap[h->offset]; } /* Get the value of an NVRAM variable. */ @@ -337,10 +337,12 @@ int nvram_commit(nvram_handle_t *h) /* Open NVRAM and obtain a handle. */ nvram_handle_t * nvram_open(const char *file, int rdonly) { + int i; int fd; char *mtd = NULL; nvram_handle_t *h; nvram_header_t *header; + int offset = -1; /* If erase size or file are undefined then try to define them */ if( (nvram_erase_size == 0) || (file == NULL) ) @@ -361,15 +363,28 @@ nvram_handle_t * nvram_open(const char *file, int rdonly) if( mmap_area != MAP_FAILED ) { - memset(mmap_area, 0xFF, NVRAM_START(nvram_erase_size)); + for( i = 0; i <= ((nvram_erase_size - NVRAM_SPACE) / sizeof(uint32_t)); i++ ) + { + if( ((uint32_t *)mmap_area)[i] == NVRAM_MAGIC ) + { + offset = i * sizeof(uint32_t); + break; + } + } - if((h = (nvram_handle_t *) malloc(sizeof(nvram_handle_t))) != NULL) + if( offset < 0 ) + { + free(mtd); + return NULL; + } + else if( (h = malloc(sizeof(nvram_handle_t))) != NULL ) { memset(h, 0, sizeof(nvram_handle_t)); h->fd = fd; h->mmap = mmap_area; h->length = nvram_erase_size; + h->offset = offset; header = nvram_header(h); |