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ntp: check PHC index before opening device

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Apparently, it is possible for an interface to report all necessary
flags for HW timestamping without having a PHC. Check the PHC index to
avoid an error message in the system log saying that /dev/ptp-1 cannot
be opened.
This commit is contained in:
Miroslav Lichvar 2018-05-21 16:49:26 +02:00
parent 76bed76289
commit 2962fc6286
1 changed files with 6 additions and 0 deletions
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6
ntp_io_linux.c
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@ -171,6 +171,12 @@ add_interface(CNF_HwTsInterface *conf_iface)
return 0;
}
if (ts_info.phc_index < 0) {
DEBUG_LOG("PHC missing on %s", req.ifr_name);
close(sock_fd);
return 0;
}
ts_config.flags = 0;
ts_config.tx_type = HWTSTAMP_TX_ON;