On Fri, Dec 17, 2021 at 9:26 AM Greg KH [off-list ref] wrote:

On Fri, Dec 17, 2021 at 09:13:15AM +0100, Benjamin Tissoires wrote:

quoted

Hi,

On 12/17/21 08:00, Thorsten Leemhuis wrote:

quoted

Hi, this is your Linux kernel regression tracker speaking.

I noticed a bugreport from Tomasz C. (CCed) that sounds a lot like a
regression between v5.15.7..v5.15.8 and likely better dealt with by email:

To quote from: https://bugzilla.kernel.org/show_bug.cgi?id=215341

quoted

After updating kernel from 5.15.7 to 5.15.8 on ArchLinux distribution, Holtek USB mouse stopped working.
Exact model:
04d9:a067 Holtek Semiconductor, Inc. USB Gaming Mouse

The dmesg output for this device from kernel version 5.15.8:

[    2.501958] usb 2-1.2.3: new full-speed USB device number 6 using ehci-pci
[    2.624369] usb 2-1.2.3: New USB device found, idVendor=04d9, idProduct=a067, bcdDevice= 1.16
[    2.624376] usb 2-1.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    2.624379] usb 2-1.2.3: Product: USB Gaming Mouse
[    2.624382] usb 2-1.2.3: Manufacturer: Holtek

After disconnecting and connecting the USB:

[   71.976731] usb 2-1.2.3: USB disconnect, device number 6
[   75.013021] usb 2-1.2.3: new full-speed USB device number 8 using ehci-pci
[   75.135865] usb 2-1.2.3: New USB device found, idVendor=04d9, idProduct=a067, bcdDevice= 1.16
[   75.135873] usb 2-1.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   75.135877] usb 2-1.2.3: Product: USB Gaming Mouse
[   75.135880] usb 2-1.2.3: Manufacturer: Holtek


On kernel version 5.15.7:

[    2.280515] usb 2-1.2.3: new full-speed USB device number 6 using ehci-pci
[    2.379777] usb 2-1.2.3: New USB device found, idVendor=04d9, idProduct=a067, bcdDevice= 1.16
[    2.379784] usb 2-1.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    2.379787] usb 2-1.2.3: Product: USB Gaming Mouse
[    2.379790] usb 2-1.2.3: Manufacturer: Holtek
[    2.398578] input: Holtek USB Gaming Mouse as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2.3/2-1.2.3:1.0/0003:04D9:A067.0005/input/input11
[    2.450977] holtek_mouse 0003:04D9:A067.0005: input,hidraw4: USB HID v1.10 Keyboard [Holtek USB Gaming Mouse] on usb-0000:00:1d.0-1.2.3/input0
[    2.451013] holtek_mouse 0003:04D9:A067.0006: Fixing up report descriptor
[    2.452189] input: Holtek USB Gaming Mouse as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2.3/2-1.2.3:1.1/0003:04D9:A067.0006/input/input12
[    2.468510] usb 2-1.2.4: new high-speed USB device number 7 using ehci-pci
[    2.503913] holtek_mouse 0003:04D9:A067.0006: input,hiddev96,hidraw5: USB HID v1.10 Mouse [Holtek USB Gaming Mouse] on usb-0000:00:1d.0-1.2.3/input1
[    2.504105] holtek_mouse 0003:04D9:A067.0007: hiddev97,hidraw6: USB HID v1.10 Device [Holtek USB Gaming Mouse] on usb-0000:00:1d.0-1.2.3/input2

Rolling back the kernel to version 5.15.7 solves the problem.

Oops, sorry. An overlook from a precedent commit.

Can you confirm the following patch works? (and also tell me if the
links I put are sufficient for regzbot)
---
rom 8f38596f2620c4b22ff9e2622917ac2b69aa8320 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <redacted>
Date: Fri, 17 Dec 2021 09:03:32 +0100
Subject: [PATCH] HID: holtek: fix mouse probing

An overlook from the previous commit: we don't even parse or start the
device, meaning that the device is not presented to user space.

Fixes: 93020953d0fa ("HID: check for valid USB device for many HID drivers")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215341
Link: https://lore.kernel.org/regressions/e4efbf13-bd8d-0370-629b-6c80c0044b15@leemhuis.info/ (local)
Signed-off-by: Benjamin Tissoires <redacted>
---
 drivers/hid/hid-holtek-mouse.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/hid/hid-holtek-mouse.c b/drivers/hid/hid-holtek-mouse.c
index b7172c48ef9f..7c907939bfae 100644
--- a/drivers/hid/hid-holtek-mouse.c
+++ b/drivers/hid/hid-holtek-mouse.c

@@ -65,8 +65,23 @@ static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 static int holtek_mouse_probe(struct hid_device *hdev,
                            const struct hid_device_id *id)
 {
+     int ret;
+
      if (!hid_is_usb(hdev))
              return -EINVAL;
+
+     ret = hid_parse(hdev);
+     if (ret) {
+             hid_err(hdev, "hid parse failed: %d\n", ret);
+             return ret;
+     }
+
+     ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+     if (ret) {
+             hid_err(hdev, "hw start failed: %d\n", ret);
+             return ret;
+     }
+
      return 0;
 }
--

2.31.1

Ugh, my fault, you did warn me about the probe function, I should have
noticed this was required, sorry about that.

Well, honestly, I should have detected it when reviewing. So we both
share the blame :)

Cheers,
Benjamin