Re: Regression during 4.13 merge window: Mouse not working (under X)

[Dmitry Torokhov]

On Wed, Jul 12, 2017 at 02:45:18PM -0700, Olof Johansson wrote:
> Dmitry,
> 
> I installed current mainline (as of 3b06b1a744) on a z840 here, and
> lost the mouse.
> 
> Bisecting down, it seems like "HID: usbhid: remove custom locking from
> usbhid_open/close" (e399396a6b0) is at fault, and if I revert that and
> 283a21da1239 I get a working system again. Userspace is Ubuntu 16.04.

Olof, does the patch below work for you?

-- 
Dmitry

HID: usbhid: fix "always poll" quirk

From: Dmitry Torokhov <dmitry.torok...@gmail.com>

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 <o...@lixom.net>
Fixes: e399396a6b0 ("HID: usbhid: remove custom locking from usbhid_open...")
Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
---
 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;