[PATCH 5.11 445/601] HID: lenovo: Fix lenovo_led_set_tp10ubkbd() error handling

Greg Kroah-Hartman
2021-05-12T17:55:49Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 658d04e6eb6be1601ae95d7bee92bbf4096cdc1e ]

Fix the following issues with lenovo_led_set_tp10ubkbd() error handling:

1. On success hid_hw_raw_request() returns the number of bytes sent.
So we should check for (ret != 3) rather then for (ret != 0).

2. Actually propagate errors to the caller.

3. Since the LEDs are part of an USB keyboard-dock the mute LEDs can go
away at any time. Don't log an error when ret == -ENODEV and set the
LED_HW_PLUGGABLE flag to avoid errors getting logged when the USB gets
disconnected.

Fixes: bc04b37ea0ec ("HID: lenovo: Add ThinkPad 10 Ultrabook Keyboard support")
Reviewed-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hid/hid-lenovo.c | 29 +++++++++++++++++++++--------
1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 4dc5e5f932ed..ee175ab54281 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -62,8 +62,8 @@ struct lenovo_drvdata {
#define TP10UBKBD_LED_OFF 1
#define TP10UBKBD_LED_ON 2

-static void lenovo_led_set_tp10ubkbd(struct hid_device *hdev, u8 led_code,
- enum led_brightness value)
+static int lenovo_led_set_tp10ubkbd(struct hid_device *hdev, u8 led_code,
+ enum led_brightness value)
{
struct lenovo_drvdata *data = hid_get_drvdata(hdev);
int ret;
@@ -75,10 +75,18 @@ static void lenovo_led_set_tp10ubkbd(struct hid_device *hdev, u8 led_code,
data->led_report[2] = value ? TP10UBKBD_LED_ON : TP10UBKBD_LED_OFF;
ret = hid_hw_raw_request(hdev, data->led_report[0], data->led_report, 3,
HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
- if (ret)
- hid_err(hdev, "Set LED output report error: %d\n", ret);
+ if (ret != 3) {
+ if (ret != -ENODEV)
+ hid_err(hdev, "Set LED output report error: %d\n", ret);
+
+ ret = ret < 0 ? ret : -EIO;
+ } else {
+ ret = 0;
+ }

mutex_unlock(&data->led_report_mutex);
+
+ return ret;
}

static void lenovo_tp10ubkbd_sync_fn_lock(struct work_struct *work)
@@ -349,7 +357,7 @@ static ssize_t attr_fn_lock_store(struct device *dev,
{
struct hid_device *hdev = to_hid_device(dev);
struct lenovo_drvdata *data = hid_get_drvdata(hdev);
- int value;
+ int value, ret;

if (kstrtoint(buf, 10, &value))
return -EINVAL;
@@ -364,7 +372,9 @@ static ssize_t attr_fn_lock_store(struct device *dev,
lenovo_features_set_cptkbd(hdev);
break;
case USB_DEVICE_ID_LENOVO_TP10UBKBD:
- lenovo_led_set_tp10ubkbd(hdev, TP10UBKBD_FN_LOCK_LED, value);
+ ret = lenovo_led_set_tp10ubkbd(hdev, TP10UBKBD_FN_LOCK_LED, value);
+ if (ret)
+ return ret;
break;
}

@@ -785,6 +795,7 @@ static int lenovo_led_brightness_set(struct led_classdev *led_cdev,
struct lenovo_drvdata *data_pointer = hid_get_drvdata(hdev);
u8 tp10ubkbd_led[] = { TP10UBKBD_MUTE_LED, TP10UBKBD_MICMUTE_LED };
int led_nr = 0;
+ int ret = 0;

if (led_cdev == &data_pointer->led_micmute)
led_nr = 1;
@@ -799,11 +810,11 @@ static int lenovo_led_brightness_set(struct led_classdev *led_cdev,
lenovo_led_set_tpkbd(hdev);
break;
case USB_DEVICE_ID_LENOVO_TP10UBKBD:
- lenovo_led_set_tp10ubkbd(hdev, tp10ubkbd_led[led_nr], value);
+ ret = lenovo_led_set_tp10ubkbd(hdev, tp10ubkbd_led[led_nr], value);
break;
}

- return 0;
+ return ret;
}

static int lenovo_register_leds(struct hid_device *hdev)
@@ -825,6 +836,7 @@ static int lenovo_register_leds(struct hid_device *hdev)
data->led_mute.name = name_mute;
data->led_mute.brightness_get = lenovo_led_brightness_get;
data->led_mute.brightness_set_blocking = lenovo_led_brightness_set;
+ data->led_mute.flags = LED_HW_PLUGGABLE;
data->led_mute.dev = &hdev->dev;
ret = led_classdev_register(&hdev->dev, &data->led_mute);
if (ret < 0)
@@ -833,6 +845,7 @@ static int lenovo_register_leds(struct hid_device *hdev)
data->led_micmute.name = name_micm;
data->led_micmute.brightness_get = lenovo_led_brightness_get;
data->led_micmute.brightness_set_blocking = lenovo_led_brightness_set;
+ data->led_micmute.flags = LED_HW_PLUGGABLE;
data->led_micmute.dev = &hdev->dev;
ret = led_classdev_register(&hdev->dev, &data->led_micmute);
if (ret < 0) {
--
2.30.2