Handle EBUSY when probing support for a PTP_SYS_OFFSET ioctl. Try each
ioctl up to three times before giving up on it to make the detection
more reliable.
Signed-off-by: Miroslav Lichvar <mlich...@redhat.com>
---
sysoff.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/sysoff.c b/sysoff.c
index a425275..fc1f7ca 100644
--- a/sysoff.c
+++ b/sysoff.c
@@ -145,8 +145,8 @@ int sysoff_measure(int fd, int method, int n_samples,
int sysoff_probe(int fd, int n_samples)
{
int64_t junk, delay;
+ int i, j, err;
uint64_t ts;
- int i;
if (n_samples > PTP_MAX_SAMPLES) {
fprintf(stderr, "warning: %d exceeds kernel max readings %d\n",
@@ -156,9 +156,15 @@ int sysoff_probe(int fd, int n_samples)
}
for (i = 0; i < SYSOFF_LAST; i++) {
- if (sysoff_measure(fd, i, n_samples, &junk, &ts, &delay) < 0)
- continue;
- return i;
+ for (j = 0; j < 3; j++) {
+ err = sysoff_measure(fd, i, n_samples, &junk, &ts,
+ &delay);
+ if (err == -EBUSY)
+ continue;
+ if (err)
+ break;
+ return i;
+ }
}
return SYSOFF_RUN_TIME_MISSING;
--
2.35.1
_______________________________________________
Linuxptp-devel mailing list
Linuxptp-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
