HID: cp2112: fix gpio-callback error handling
authorJohan Hovold <johan@kernel.org>
Mon, 30 Jan 2017 10:26:39 +0000 (11:26 +0100)
committerJiri Kosina <jkosina@suse.cz>
Tue, 31 Jan 2017 11:59:33 +0000 (12:59 +0100)
In case of a zero-length report, the gpio direction_input callback would
currently return success instead of an errno.

Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable")
Cc: stable <stable@vger.kernel.org> # 4.9
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
drivers/hid/hid-cp2112.c

index 3e0b6bad29f200fbd314c12077ff7180e9d63c03..b22d0f83f8e38a9ee0d0eb7381e95d6b90442b61 100644 (file)
@@ -213,7 +213,7 @@ static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 
 exit:
        mutex_unlock(&dev->lock);
-       return ret <= 0 ? ret : -EIO;
+       return ret < 0 ? ret : -EIO;
 }
 
 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)