release/5.2.46/HID-logitech-dj-Really-fix-return-value-of-logi_dj_r.patch

From e9e4eea2dd6ae0e7e379ff184c3ff40698f7b2c9 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 29 Jul 2019 17:50:36 +0200
Subject: [PATCH] HID: logitech-dj: Really fix return value of
 logi_dj_recv_query_hidpp_devices

commit 6fb08f1a5f7e5cdde1ce00104788e602f4299b99 upstream.

Commit dbcbabf7da92 ("HID: logitech-dj: fix return value of
logi_dj_recv_query_hidpp_devices") made logi_dj_recv_query_hidpp_devices
return the return value of hid_hw_raw_request instead of unconditionally
returning 0.

But hid_hw_raw_request returns the report-size on a successful request
(and a negative error-code on failure) where as the callers of
logi_dj_recv_query_hidpp_devices expect a 0 return on success.

This commit fixes things so that either the negative error gets returned
or 0 on success, fixing HID++ receivers such as the Logitech nano receivers
no longer working.

Cc: YueHaibing <yuehaibing@huawei.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: dbcbabf7da92 ("HID: logitech-dj: fix return value of logi_dj_recv_query_hidpp_devices")
Reported-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reported-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Tested-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 651a74df6978..09ee227b1a35 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -1123,7 +1123,7 @@ static int logi_dj_recv_query_hidpp_devices(struct dj_receiver_dev *djrcv_dev)
 				    HID_REQ_SET_REPORT);
 
 	kfree(hidpp_report);
-	return retval;
+	return (retval < 0) ? retval : 0;
 }
 
 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
-- 
2.7.4