I just know that netif_rx() should be updated to netif_rx_ni() for newer kernels. Without the change I had NOHZ errors in the log, the same change was done in SLCAN. Maybe this is the origin of your problem. You can try our fork on https://github.com/tjohann/sllin which includes many improvents and fixes compared to the original driver from 2013. On Tue, Feb 02, 2016 at 10:09:20AM +0100, Sandro Stiller wrote: > Hello, > > I'm struggeling with a network driver (sllin[1]) which is not in the > official kernel. > It has a lot in common with the slcan driver but is used for LIN networks. > The problem is, that sometimes messages sent to the network layer via > netif_rx() don't arrive in all listening programs. > > This is how the driver works: > 1. The application sends CAN messages to the network interface > 2. The driver forwards it to the UART (tty) > 3. The UART receives the same message (single-wire connection, RX and TX > connected) and sends it back to the network layer > 4. The sending application receives the previously sent message and can > check for transmission errors and appended LIN slave replies. > > Sometimes the last point (4.) does not work after 10 - 40 seconds of > transmission. > The application does not receive the message using a blocking read() on > the socket, but other processes receive it (running candump on the > interface). netif_rx() always returns 0. > > If more programs are listening (running multiple instances of candump), > the problem appears less often or never. > On my PC there is no problem, it occures on ARM only. > I'm using kernel 4.1. > > Can you give me a hint where to search for the cause of this behaviour? > > Thank you very much. > > Sandro > > > [1]: https://github.com/sstiller/sllin/tree/master/sllin > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
