[PATCH v2 2/2] ptp: ptp_s390: Add missing facility check
From: Sven Schnelle <svens@linux.ibm.com>
Date: 2026-07-14 13:04:15
Also in:
linux-s390, lkml
Subsystem:
networking drivers, ptp hardware clock support, s390 ptp driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Richard Cochran, Sven Schnelle, Linus Torvalds
Only register the physical clock when facility 28 is installed
and PTFF QAF returns that PTFF QPT is available.
Fixes: 2d7de7a3010d ("s390/time: Add PtP driver")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Cc: stable@kernel.org
---
drivers/ptp/ptp_s390.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/ptp/ptp_s390.c b/drivers/ptp/ptp_s390.c
index 29618eb9bf44..02d624d89a0a 100644
--- a/drivers/ptp/ptp_s390.c
+++ b/drivers/ptp/ptp_s390.c@@ -107,6 +107,9 @@ static __init int ptp_s390_init(void) if (IS_ERR(ptp_stcke_clock)) return PTR_ERR(ptp_stcke_clock); + if (!test_facility(28) || !ptff_query(PTFF_QPT)) + return 0; + ptp_qpt_clock = ptp_clock_register(&ptp_s390_qpt_info, NULL); if (IS_ERR(ptp_qpt_clock)) { ptp_clock_unregister(ptp_stcke_clock);
@@ -117,7 +120,8 @@ static __init int ptp_s390_init(void) static __exit void ptp_s390_exit(void) { - ptp_clock_unregister(ptp_qpt_clock); + if (ptp_qpt_clock) + ptp_clock_unregister(ptp_qpt_clock); ptp_clock_unregister(ptp_stcke_clock); }
--
2.55.0