From: Pavel Pisa <p...@cmp.felk.cvut.cz> A CAN sja1000 standard frame filter mask has been computed and applied incorrectly for standard frames when single Acceptance Filter Mode (MOD_AFM = 1) has been selected. The problem has not been found by Linux kernel testing because it uses dual filter mode (MOD_AFM = 0) and leaves falters fully open.
The problem has been noticed by Grant Ramsay when testing with Zephyr RTOS which uses single filter mode. Signed-off-by: Pavel Pisa <p...@cmp.felk.cvut.cz> Reported-by: Grant Ramsay <gram...@enphaseenergy.com> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2028 Fixes: 733210e754 ("hw/net/can: SJA1000 chip register level emulation") --- hw/net/can/can_sja1000.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/net/can/can_sja1000.c b/hw/net/can/can_sja1000.c index 73201f9139..575df7d2f8 100644 --- a/hw/net/can/can_sja1000.c +++ b/hw/net/can/can_sja1000.c @@ -108,7 +108,7 @@ void can_sja_single_filter(struct qemu_can_filter *filter, } filter->can_mask = (uint32_t)amr[0] << 3; - filter->can_mask |= (uint32_t)amr[1] << 5; + filter->can_mask |= (uint32_t)amr[1] >> 5; filter->can_mask = ~filter->can_mask & QEMU_CAN_SFF_MASK; if (!(amr[1] & 0x10)) { filter->can_mask |= QEMU_CAN_RTR_FLAG; -- 2.39.2
