From: Marek Vasut marex@denx.de

The bin_attr_nvmem_write() must check the read_only flag and block writes on read-only devices, now that a nvmem device can be switched between read-write and read-only mode at runtime using the force_ro attribute. Add the missing check.

Fixes: 9d7eb234ac7a ("nvmem: core: Implement force_ro sysfs attribute") Cc: Stable@vger.kernel.org Signed-off-by: Marek Vasut marex@denx.de Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org --- drivers/nvmem/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 33ffa2aa4c11..e1a15fbc6ad0 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -267,7 +267,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj,

count = round_down(count, nvmem->word_size);

- if (!nvmem->reg_write) + if (!nvmem->reg_write || nvmem->read_only) return -EPERM;

rc = nvmem_reg_write(nvmem, pos, buf, count);