4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Axel Lin axel.lin@ingics.com
commit c5bc6e526d3f217ed2cc3681d256dc4a2af4cc2b upstream.
Current code test wrong value so it does not verify if the written data is correctly read back. Fix it. Also make it return -EPERM if read value does not match written bit, just like it done for adnp_gpio_direction_output().
Fixes: 5e969a401a01 ("gpio: Add Avionic Design N-bit GPIO expander support") Cc: stable@vger.kernel.org Signed-off-by: Axel Lin axel.lin@ingics.com Reviewed-by: Thierry Reding thierry.reding@gmail.com Signed-off-by: Bartosz Golaszewski bgolaszewski@baylibre.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpio/gpio-adnp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpio-adnp.c +++ b/drivers/gpio/gpio-adnp.c @@ -137,8 +137,10 @@ static int adnp_gpio_direction_input(str if (err < 0) goto out;
- if (err & BIT(pos)) - err = -EACCES; + if (value & BIT(pos)) { + err = -EPERM; + goto out; + }
err = 0;