diff options
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 60670b2f70b9..e00b12aa5ec9 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -23,6 +23,7 @@ #include <linux/idr.h> #include <linux/backing-dev.h> #include <linux/gfp.h> +#include <linux/random.h> #include <linux/slab.h> #include <linux/reboot.h> #include <linux/leds.h> @@ -966,6 +967,26 @@ static int mtd_otp_nvmem_add(struct mtd_info *mtd) } if (size > 0) { + /* + * The factory OTP contains thing such as a unique serial + * number and is small, so let's read it out and put it + * into the entropy pool. + */ + void *otp; + + otp = kmalloc(size, GFP_KERNEL); + if (!otp) { + err = -ENOMEM; + goto err; + } + err = mtd_nvmem_fact_otp_reg_read(mtd, 0, otp, size); + if (err < 0) { + kfree(otp); + goto err; + } + add_device_randomness(otp, err); + kfree(otp); + nvmem = mtd_otp_nvmem_register(mtd, "factory-otp", size, mtd_nvmem_fact_otp_reg_read); if (IS_ERR(nvmem)) { |