[PATCH 6.9 138/374] s390/ap: Fix bind complete udev event sent after each AP bus scan

Greg Kroah-Hartman
2024-06-06T14:09:37Z

From: Harald Freudenberger <freude@linux.ibm.com>

[ Upstream commit 306d6bda8f97432f9cb69b5cbd86afd3a8ca182f ]

With the mentioned commit (see the fixes tag) on every AP bus scan an
uevent "AP bus change bindings complete" is emitted. Furthermore if an AP
device switched from one driver to another, for example by manipulating the
apmask, there was never a "bindings complete" uevent generated.

The "bindings complete" event should be sent once when all AP devices have
been bound to device drivers and again if unbind/bind actions take place
and finally all AP devices are bound again. Therefore implement this.

Fixes: 778412ab915d ("s390/ap: rearm APQNs bindings complete completion")
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/crypto/ap_bus.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index cce0bafd4c926..f13837907bd5e 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -767,9 +767,9 @@ static void ap_check_bindings_complete(void)
if (bound == apqns) {
if (!completion_done(&ap_apqn_bindings_complete)) {
complete_all(&ap_apqn_bindings_complete);
+ ap_send_bindings_complete_uevent();
pr_debug("%s all apqn bindings complete\n", __func__);
}
- ap_send_bindings_complete_uevent();
}
}
}
@@ -929,6 +929,12 @@ static int ap_device_probe(struct device *dev)
goto out;
}

+ /*
+ * Rearm the bindings complete completion to trigger
+ * bindings complete when all devices are bound again
+ */
+ reinit_completion(&ap_apqn_bindings_complete);
+
/* Add queue/card to list of active queues/cards */
spin_lock_bh(&ap_queues_lock);
if (is_queue_dev(dev))
--
2.43.0