diff options
| -rw-r--r-- | drivers/firmware/broadcom/bcm47xx_nvram.c | 43 |
1 files changed, 25 insertions, 18 deletions
diff --git a/drivers/firmware/broadcom/bcm47xx_nvram.c b/drivers/firmware/broadcom/bcm47xx_nvram.c index 99f3ec180be6..09f51b95849e 100644 --- a/drivers/firmware/broadcom/bcm47xx_nvram.c +++ b/drivers/firmware/broadcom/bcm47xx_nvram.c @@ -55,11 +55,34 @@ static u32 find_nvram_size(void __iomem *end) } /** + * bcm47xx_nvram_copy - copy NVRAM to internal buffer + */ +static void bcm47xx_nvram_copy(void __iomem *nvram_start, size_t res_size) +{ + struct nvram_header __iomem *header = nvram_start; + size_t copy_size; + + copy_size = header->len; + if (copy_size > res_size) { + pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n"); + copy_size = res_size; + } + if (copy_size >= NVRAM_SPACE) { + pr_err("nvram on flash (%zu bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", + copy_size, NVRAM_SPACE - 1); + copy_size = NVRAM_SPACE - 1; + } + + __ioread32_copy(nvram_buf, nvram_start, DIV_ROUND_UP(copy_size, 4)); + nvram_buf[NVRAM_SPACE - 1] = '\0'; + nvram_len = copy_size; +} + +/** * bcm47xx_nvram_find_and_copy - find NVRAM on flash mapping & copy it */ static int bcm47xx_nvram_find_and_copy(void __iomem *flash_start, size_t res_size) { - struct nvram_header __iomem *header; size_t flash_size; size_t offset; u32 size; @@ -95,23 +118,7 @@ static int bcm47xx_nvram_find_and_copy(void __iomem *flash_start, size_t res_siz return -ENXIO; found: - header = (struct nvram_header *)(flash_start + offset); - __ioread32_copy(nvram_buf, header, sizeof(*header) / 4); - nvram_len = ((struct nvram_header *)(nvram_buf))->len; - size = res_size - offset; - if (nvram_len > size) { - pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n"); - nvram_len = size; - } - if (nvram_len >= NVRAM_SPACE) { - pr_err("nvram on flash (%zu bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", - nvram_len, NVRAM_SPACE - 1); - nvram_len = NVRAM_SPACE - 1; - } - /* proceed reading data after header */ - __ioread32_copy(nvram_buf + sizeof(*header), header + 1, - DIV_ROUND_UP(nvram_len, 4)); - nvram_buf[NVRAM_SPACE - 1] = '\0'; + bcm47xx_nvram_copy(flash_start + offset, res_size - offset); return 0; } |