Hi Marc, On Mon, Jun 21, 2021 at 9:37 AM Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote: > Can you test if > https://lore.kernel.org/r/20210621123436.2897023-1-mkl@xxxxxxxxxxxxxx > fixes your problem? We still have to check if lockdep complains... I tested your series and I don't see the initial RCU errors after launching the application, but now it causes a storm of cansequence errors: root@verdin-imx8mm:~# ./cantest.sh start root@verdin-imx8mm:~# interface = can1, family = 29, type = 3, proto = 1 interface = can1, family = 29, type = 3, proto = 1 interface = can0, family = 29, type = 3, proto = 1 interface = can0, family = 29, type = 3, proto = 1 2020-02-12 19:36:05:161 sequence CNT: 1304, RX: 39 expected: 24 missing: 15 skt overfl d: 0 a: 0 delta: 15 incident: 1 seq_wrap RX: 5 sequ_wrap_expected: 5 overall lost: 15 2020-02-12 19:36:05:406 sequence CNT: 3015, RX: 230 expected: 199 missing: 31 skt overfl d: 0 a: 0 delta: 31 incident: 1 seq_wrap RX: 11 sequ_wrap_expected: 11 overall lost: 31 2020-02-12 19:36:05:455 sequence CNT: 742, RX: 238 expected: 230 missing: 8 skt overfl d: 0 a: 0 delta: 8 incident: 2 seq_wrap RX: 7 sequ_wrap_expected: 7 overall lost: 23 2020-02-12 19:36:05:730 sequence CNT: 1287, RX: 8 expected: 7 missing: 1 skt overfl d: 0 a: 0 delta: 1 incident: 3 seq_wrap RX: 12 sequ_wrap_expected: 12 overall lost: 24 2020-02-12 19:36:05:746 sequence CNT: 991, RX: 228 expected: 223 missing: 5 skt overfl d: 0 a: 0 delta: 5 incident: 4 seq_wrap RX: 15 sequ_wrap_expected: 15 overall lost: 29 .... For mcp2518fd usage with imx8mm: would you recommend SPI in PIO or DMA mode? Looking at your imx6dl devicetree it seems you use DMA. Thanks
