linux-kernel - [PATCH 4.19 101/134] gpio: adnp: Fix testing wrong value in adnp_gpio_direction

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Date:   Mon,  1 Apr 2019 19:02:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Axel Lin <axel.lin@...ics.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 4.19 101/134] gpio: adnp: Fix testing wrong value in adnp_gpio_direction_input

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Axel Lin <axel.lin@...ics.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@...r.kernel.org>
Signed-off-by: Axel Lin <axel.lin@...ics.com>
Reviewed-by: Thierry Reding <thierry.reding@...il.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -132,8 +132,10 @@ 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;