From: Joy Chakraborty joychakr@google.com

Read/write callbacks registered with nvmem core expect 0 to be returned on success and a negative value to be returned on failure.

meson_efuse_read() and meson_efuse_write() call into meson_sm_call_read() and meson_sm_call_write() respectively which return the number of bytes read or written on success as per their api description.

Fix to return error if meson_sm_call_read()/meson_sm_call_write() returns an error else return 0.

Fixes: a29a63bdaf6f ("nvmem: meson-efuse: simplify read callback") Cc: stable@vger.kernel.org Signed-off-by: Joy Chakraborty joychakr@google.com Reviewed-by: Dan Carpenter dan.carpenter@linaro.org Reviewed-by: Neil Armstrong neil.armstrong@linaro.org Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org --- drivers/nvmem/meson-efuse.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c index 33678d0af2c2..6c2f80e166e2 100644 --- a/drivers/nvmem/meson-efuse.c +++ b/drivers/nvmem/meson-efuse.c @@ -18,18 +18,24 @@ static int meson_efuse_read(void *context, unsigned int offset, void *val, size_t bytes) { struct meson_sm_firmware *fw = context; + int ret;

- return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset, - bytes, 0, 0, 0); + ret = meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset, + bytes, 0, 0, 0); + + return ret < 0 ? ret : 0; }

static int meson_efuse_write(void *context, unsigned int offset, void *val, size_t bytes) { struct meson_sm_firmware *fw = context; + int ret; + + ret = meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset, + bytes, 0, 0, 0);

- return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset, - bytes, 0, 0, 0); + return ret < 0 ? ret : 0; }

static const struct of_device_id meson_efuse_match[] = {