54 lines
1.5 KiB
Diff
54 lines
1.5 KiB
Diff
From 11ae077e31d9957df01aacfa17eea5b5d548b249 Mon Sep 17 00:00:00 2001
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From: Miroslav Lichvar <mlichvar@redhat.com>
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Date: Wed, 18 May 2022 11:33:37 +0200
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Subject: [PATCH 9/54] sysoff: Retry on EBUSY when probing supported ioctls.
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Handle EBUSY when probing support for a PTP_SYS_OFFSET ioctl. Try each
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ioctl up to three times before giving up on it to make the detection
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more reliable.
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Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
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[commit dadd2593c7beaee9eba5828a7bd8a0b5849dd8bb upstream]
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Signed-off-by: Douglas Henrique Koerich <douglashenrique.koerich@windriver.com>
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Signed-off-by: Andre Mauricio Zelak <andre.zelak@windriver.com>
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---
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sysoff.c | 14 ++++++++++----
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1 file changed, 10 insertions(+), 4 deletions(-)
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diff --git a/sysoff.c b/sysoff.c
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index a425275..fc1f7ca 100644
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--- a/sysoff.c
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+++ b/sysoff.c
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@@ -145,8 +145,8 @@ int sysoff_measure(int fd, int method, int n_samples,
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int sysoff_probe(int fd, int n_samples)
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{
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int64_t junk, delay;
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+ int i, j, err;
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uint64_t ts;
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- int i;
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if (n_samples > PTP_MAX_SAMPLES) {
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fprintf(stderr, "warning: %d exceeds kernel max readings %d\n",
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@@ -156,9 +156,15 @@ int sysoff_probe(int fd, int n_samples)
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}
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for (i = 0; i < SYSOFF_LAST; i++) {
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- if (sysoff_measure(fd, i, n_samples, &junk, &ts, &delay) < 0)
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- continue;
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- return i;
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+ for (j = 0; j < 3; j++) {
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+ err = sysoff_measure(fd, i, n_samples, &junk, &ts,
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+ &delay);
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+ if (err == -EBUSY)
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+ continue;
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+ if (err)
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+ break;
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+ return i;
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+ }
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}
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return SYSOFF_RUN_TIME_MISSING;
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--
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2.29.2
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