drivers/net/can/ti_hecc.c:

When closing the can device, its not ensured that it gets removed from the socket-poll list.

The problem here lies in the ti_hecc_rx_poll() function which returns early when the device is closed already.
This leads to napi_complete() never being called, thus the device stays in the napi's poll list forever and every task reading from any socket is polling this device. The system is now basically unreachable.

The patch attached seams to fix this problem by removing the early return in the ti_hecc_rx_poll function. But I'm not sure whether this is the correct solution.