On Jul 12 2017 or thereabouts, Dmitry Torokhov wrote:
> Even though the IO for devices with "always poll" quirk is already running,
> we still need to set HID_OPENED bit in usbhid->iofl so the interrupt
> handler does not ignore the data coming from the device.
>
> Reported-by: Olof Johansson <olof@xxxxxxxxx>
> Tested-by: Olof Johansson <olof@xxxxxxxxx>
> Fixes: e399396a6b0 ("HID: usbhid: remove custom locking from usbhid_open...")
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> ---
slightly reviewed and
Acked-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cheers,
Benjamin
> drivers/hid/usbhid/hid-core.c | 16 ++++++++++------
> 1 file changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
> index 76013eb5cb7f..c008847e0b20 100644
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -680,18 +680,21 @@ static int usbhid_open(struct hid_device *hid)
> struct usbhid_device *usbhid = hid->driver_data;
> int res;
>
> + set_bit(HID_OPENED, &usbhid->iofl);
> +
> if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
> return 0;
>
> res = usb_autopm_get_interface(usbhid->intf);
> /* the device must be awake to reliably request remote wakeup */
> - if (res < 0)
> + if (res < 0) {
> + clear_bit(HID_OPENED, &usbhid->iofl);
> return -EIO;
> + }
>
> usbhid->intf->needs_remote_wakeup = 1;
>
> set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
> - set_bit(HID_OPENED, &usbhid->iofl);
> set_bit(HID_IN_POLLING, &usbhid->iofl);
>
> res = hid_start_in(hid);
> @@ -727,19 +730,20 @@ static void usbhid_close(struct hid_device *hid)
> {
> struct usbhid_device *usbhid = hid->driver_data;
>
> - if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
> - return;
> -
> /*
> * Make sure we don't restart data acquisition due to
> * a resumption we no longer care about by avoiding racing
> * with hid_start_in().
> */
> spin_lock_irq(&usbhid->lock);
> - clear_bit(HID_IN_POLLING, &usbhid->iofl);
> clear_bit(HID_OPENED, &usbhid->iofl);
> + if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
> + clear_bit(HID_IN_POLLING, &usbhid->iofl);
> spin_unlock_irq(&usbhid->lock);
>
> + if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
> + return;
> +
> hid_cancel_delayed_stuff(usbhid);
> usb_kill_urb(usbhid->urbin);
> usbhid->intf->needs_remote_wakeup = 0;
> --
> 2.13.2.932.g7449e964c-goog
>
>
> --
> Dmitry
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