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ptp: ptp_s390: Add missing facility check

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Only register the physical clock when facility 28 is installed
and PTFF QAF returns that PTFF QPT is available.

Fixes: 2d7de7a301 ("s390/time: Add PtP driver")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Cc: stable@kernel.org
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://patch.msgid.link/20260714130342.1971700-3-svens@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sven Schnelle 2026-07-14 15:03:42 +02:00 committed by Jakub Kicinski
parent 9de445d829
commit e78f1ac37a
1 changed files with 5 additions and 1 deletions
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6
drivers/ptp/ptp_s390.c
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@ -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);
}