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Clark" Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Lee Jones , Pavel Machek , linux-leds@vger.kernel.org Subject: [PATCH 06/15] HID: hid-oxp: serialize complete RGB updates Date: Wed, 9 Sep 2026 22:21:06 -0500 Message-ID: <20260910032115.28669-7-andrei1998@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260910032115.28669-1-andrei1998@gmail.com> References: <20260910032115.28669-1-andrei1998@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The transport mutex protects one report at a time, but changing an RGB effect requires a status command followed by a color or effect command. Serialize whole RGB transactions so sysfs and delayed brightness work do not interleave these command sequences. Fixes: 84910c459d65 ("HID: hid-oxp: Add OneXPlayer configuration driver") Assisted-by: LLM Reviewed-by: Derek J. Clark Signed-off-by: Andrei Aldea --- drivers/hid/hid-oxp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/hid/hid-oxp.c b/drivers/hid/hid-oxp.c index bee1317..8d07816 100644 --- a/drivers/hid/hid-oxp.c +++ b/drivers/hid/hid-oxp.c @@ -181,6 +181,7 @@ static struct oxp_hid_cfg { struct led_classdev_mc *led_mc; struct hid_device *hdev; struct mutex cfg_mutex; /*ensure single synchronous output report*/ + struct mutex rgb_mutex; /*serialize complete RGB transactions*/ u8 rgb_brightness; u8 gamepad_mode; u8 rumble_intensity; @@ -1074,6 +1075,8 @@ static ssize_t oxp_rgb_status_show(void) u16 up = get_usage_page(drvdata.hdev); u8 *data; + guard(mutex)(&drvdata.rgb_mutex); + switch (up) { case GEN1_USAGE_PAGE: data = (u8[1]) { OXP_GET_PROPERTY }; @@ -1191,6 +1194,8 @@ static ssize_t enabled_store(struct device *dev, struct device_attribute *attr, return ret; val = ret; + guard(mutex)(&drvdata.rgb_mutex); + ret = oxp_rgb_status_store(val, drvdata.rgb_speed, drvdata.rgb_brightness); if (ret) @@ -1244,6 +1249,8 @@ static ssize_t effect_store(struct device *dev, struct device_attribute *attr, val = ret; + guard(mutex)(&drvdata.rgb_mutex); + ret = oxp_rgb_status_store(drvdata.rgb_en, drvdata.rgb_speed, drvdata.rgb_brightness); if (ret) @@ -1302,6 +1309,8 @@ static ssize_t speed_store(struct device *dev, struct device_attribute *attr, if (val > 9) return -EINVAL; + guard(mutex)(&drvdata.rgb_mutex); + ret = oxp_rgb_status_store(drvdata.rgb_en, val, drvdata.rgb_brightness); if (ret) return ret; @@ -1340,6 +1349,8 @@ static void oxp_rgb_queue_fn(struct work_struct *work) u8 val = 4 * brightness / max_brightness; int ret; + guard(mutex)(&drvdata.rgb_mutex); + if (drvdata.rgb_brightness != val) { ret = oxp_rgb_status_store(drvdata.rgb_en, drvdata.rgb_speed, val); if (ret) @@ -1470,6 +1481,7 @@ static int oxp_cfg_probe(struct hid_device *hdev, u16 up) hid_set_drvdata(hdev, &drvdata); mutex_init(&drvdata.cfg_mutex); + mutex_init(&drvdata.rgb_mutex); drvdata.hdev = hdev; if (up == GEN2_USAGE_PAGE && oxp_hybrid_mcu_device())