2010/1/9 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>: > Hi: > > USB: Move hcd free_dev call into usb_disconnect > > I found a way to oops the kernel bug: > > 1. Open a USB device through devio. > 2. Remove the hcd module in the host kernel. > 3. Close the devio file descriptor. > > The problem is that closing the file descriptor does usb_release_dev > as it is the last reference. usb_release_dev then tries to invoke > the hcd free_dev function (or rather dereferencing the hcd driver > struct). This causes an oops as the hcd driver has already been > unloaded so the struct is gone. free_dev is introduced for xHCI controller. Is your usb host controller xHCI? seems there is few now, :-) If so, comment for free_dev of hc_driver may be updated with your patch. Thanks, -- Lei Ming -- 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
