The kernel panic happened when the iio sensor hid usb device was removed. It tries to set the power state by calling hid_hw_request(). This was on kernel 3.16-rc6 https://gist.github.com/soda0289/2ff543d9cfff6f92c360#file-kernel-panic-when-iio-sensor-usb-device-is-removed On Fri, Jul 25, 2014 at 12:13 AM, Reyad Attiyat <reyad.attiyat@xxxxxxxxx> wrote: > 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 <reyad.attiyat@xxxxxxxxx> > --- > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
