From: Enrik Berkhan <Enrik.Berkhan@xxxxxxx> commit 67c90d14018775556d5420382ace86521421f9ff upstream. The MCP2221 driver should not connect to the hidraw userspace interface, as it needs exclusive access to the chip. If you want to use /dev/hidrawX with the MCP2221, you need to avoid binding this driver to the device and use the hid generic driver instead (e.g. using udev rules). Cc: stable@xxxxxxxxxxxxxxx Reported-by: Sven Zühlsdorf <sven.zuehlsdorf@xxxxxxxx> Signed-off-by: Enrik Berkhan <Enrik.Berkhan@xxxxxxx> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221103222714.21566-2-Enrik.Berkhan@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/hid/hid-mcp2221.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) --- a/drivers/hid/hid-mcp2221.c +++ b/drivers/hid/hid-mcp2221.c @@ -840,12 +840,19 @@ static int mcp2221_probe(struct hid_devi return ret; } - ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); + /* + * This driver uses the .raw_event callback and therefore does not need any + * HID_CONNECT_xxx flags. + */ + ret = hid_hw_start(hdev, 0); if (ret) { hid_err(hdev, "can't start hardware\n"); return ret; } + hid_info(hdev, "USB HID v%x.%02x Device [%s] on %s\n", hdev->version >> 8, + hdev->version & 0xff, hdev->name, hdev->phys); + ret = hid_hw_open(hdev); if (ret) { hid_err(hdev, "can't open device\n"); @@ -870,8 +877,7 @@ static int mcp2221_probe(struct hid_devi mcp->adapter.retries = 1; mcp->adapter.dev.parent = &hdev->dev; snprintf(mcp->adapter.name, sizeof(mcp->adapter.name), - "MCP2221 usb-i2c bridge on hidraw%d", - ((struct hidraw *)hdev->hidraw)->minor); + "MCP2221 usb-i2c bridge"); ret = i2c_add_adapter(&mcp->adapter); if (ret) {
