linux-kernel - [PATCH v3 12/19] HID: logitech-hidpp: return an error if the queried feature is not present

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Message-Id: <20170327145939.29824-13-benjamin.tissoires@redhat.com>
Date:   Mon, 27 Mar 2017 16:59:32 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>, Bastien Nocera <hadess@...ess.net>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 12/19] HID: logitech-hidpp: return an error if the queried feature is not present

Or the device just answers a valid feature '0'.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

changes in v3:
- moved up in the series

no changes in v2
---
 drivers/hid/hid-logitech-hidpp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 9a9771a..22129dd 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -503,6 +503,9 @@ static int hidpp_root_get_feature(struct hidpp_device *hidpp, u16 feature,
 	if (ret)
 		return ret;
 
+	if (response.fap.params[0] == 0)
+		return -ENOENT;
+
 	*feature_index = response.fap.params[0];
 	*feature_type = response.fap.params[1];
 
-- 
2.9.3