Race related to e04a0442d33b "HID: core: remove the absolute need of hid_have_special_driver[]"

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Due to some other issue with one devices supported by hid-led I figured
out that it's no longer needed to list devices with own driver in
hid_have_special_driver[].

So I removed the entries for the hid-led devices and got the following.
When I plugged in the device first the device-specific driver wasn't
loaded. After unplugging/re-plugging the device-specific driver was
loaded properly.

It seems usbhid module wasn't fully loaded and active yet when
hid-generic checks for a device-specific driver for the first time.
This also explains why the second attempt was successful.

Did you come across similar races? At a first glance I'm not sure how
to prevent this race. Any idea?

[   15.785205] usb 2-5: new low-speed USB device number 4 using xhci_hcd
[   15.917766] usb 2-5: New USB device found, idVendor=0fc5, idProduct=b080, bcdDevice= 0.1f
[   15.917842] usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   15.917899] usb 2-5: Product: USB IO Controller
[   15.917941] usb 2-5: Manufacturer: Delcom Products Inc.
[   15.943667] hid-generic 0003:0FC5:B080.0001: hiddev96,hidraw0: USB HID v1.00 Device [Delcom Products Inc. USB IO Controller ] on usb-0000:00:14.0-5/input0
[   15.944171] usbcore: registered new interface driver usbhid
[   15.944204] usbhid: USB HID core driver
[  101.496255] usb 2-5: USB disconnect, device number 4
[  107.364402] usb 2-5: new low-speed USB device number 5 using xhci_hcd
[  107.496582] usb 2-5: New USB device found, idVendor=0fc5, idProduct=b080, bcdDevice= 0.1f
[  107.496659] usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  107.496716] usb 2-5: Product: USB IO Controller
[  107.496757] usb 2-5: Manufacturer: Delcom Products Inc.
[  107.510676] hid-led 0003:0FC5:B080.0002: hidraw0: USB HID v1.00 Device [Delcom Products Inc. USB IO Controller ] on usb-0000:00:14.0-5/input0
[  107.511975] hid-led 0003:0FC5:B080.0002: Delcom Visual Signal Indicator G2 initialized
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux