Since version 6.0.0 (specifically [1]), the kernel has a new flag:
CAN_ERR_CNT to notify whether or not the error counter is set. Use
this to decide whether on not the error-counter-tx-rx should be
printed.
This way, when a driver set data[6] and data[7] to zero, it is
possible to differentiate whether the error counter is not available
or if the drivers simply reported both counters to be zero.
For interoperability reasons, continue to check data[6] and data[7]
against zero so that the code still works with the old behavior if
run on a kernel version lower than 6.0.0.
[1] commit 3e5c291c7942 ("can: add CAN_ERR_CNT flag to notify
availability of error counter")
Link: https://git.kernel.org/torvalds/linux/c/3e5c291c7942
Signed-off-by: Vincent Mailhol <mailhol.vincent@xxxxxxxxxx>
---
lib.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib.c b/lib.c
index 3c1a0d9..0f9b510 100644
--- a/lib.c
+++ b/lib.c
@@ -679,7 +679,7 @@ void snprintf_can_error_frame(char *buf, size_t len, const struct canfd_frame *c
}
}
- if (cf->data[6] || cf->data[7]) {
+ if (cf->can_id & CAN_ERR_CNT || cf->data[6] || cf->data[7]) {
n += snprintf(buf + n, len - n, "%s", sep);
n += snprintf(buf + n, len - n, "error-counter-tx-rx{{%d}{%d}}",
cf->data[6], cf->data[7]);
--
2.37.4
