[PATCH] hid: usbhid: Use flag HID_DISCONNECTED when a usb device is removed

Set disconnected flag in struct usbhid when a usb device
is removed. Check for disconnected flag before sending urb
requests. This prevents a kernel panic when a hid driver calls
hid_hw_request() after removing a usb device.

Signed-off-by: Reyad Attiyat <redacted>
---
 drivers/hid/usbhid/hid-core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 7b88f4c..c8fa957 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c

@@ -536,7 +536,8 @@ static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *re
        int head;
        struct usbhid_device *usbhid = hid->driver_data;

-       if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)
+       if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
+               test_bit(HID_DISCONNECTED, &usbhid->iofl))
                return;

        if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {

@@ -1366,6 +1367,9 @@ static void usbhid_disconnect(struct usb_interface *intf)
                return;

        usbhid = hid->driver_data;
+       spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
+       set_bit(HID_DISCONNECTED, &usbhid->iofl);
+       spin_unlock_irq(&usbhid->lock);
        hid_destroy_device(hid);
        kfree(usbhid);
 }
--

1.9.3