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

From Benjamin Tissoires <benjamin.tissoires@redhat.com>
Newsgroups linux.kernel
Subject [PATCH v3 12/19] HID: logitech-hidpp: return an error if the queried feature is not present
Date 2017-03-27 17:10 +0200
Message-ID <tpEro-1wA-21@gated-at.bofh.it> (permalink)
References <tpErn-1wA-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.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

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Thread

[PATCH v3 00/19] Report power supply from hid-logitech-hidpp Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 12/19] HID: logitech-hidpp: return an error if the queried feature is not present Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 11/19] HID: logitech-hidpp: create the battery for all types of HID++ devices Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 08/19] HID: logitech-hidpp: rework hidpp_connect_event() Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 10/19] HID: logitech-hidpp: forward device info in power_supply Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 14/19] HID: logitech-hidpp: battery: provide ONLINE property Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 17/19] HID: logitech-hidpp: add support for battery status for the K750 Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 15/19] HID: logitech-hidpp: rename battery level into capacity Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 18/19] HID: logitech-hidpp: enable HID++ 1.0 battery reporting Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 03/19] HID: logitech-hidpp: make sure we only register one battery per device Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 06/19] HID: logitech-hidpp: rework probe path for unifying devices Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 09/19] HID: logitech-hidpp: handle battery events in hidpp_raw_hidpp_event() Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  [PATCH v3 13/19] HID: logitech-hidpp: notify battery on connect Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2017-03-27 17:10 +0200
  Re: [PATCH v3 00/19] Report power supply from hid-logitech-hidpp Bastien Nocera <hadess@hadess.net> - 2017-03-27 18:30 +0200

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