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Date: Mon, 8 Nov 2021 11:11:51 +0100
From: Borislav Petkov <bp@...en8.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: linux-s390@...r.kernel.org
Subject: [PATCH v0 36/42] s390: Check notifier registration return value
From: Borislav Petkov <bp@...e.de>
Avoid homegrown notifier registration checks.
No functional changes.
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: linux-s390@...r.kernel.org
---
arch/s390/kernel/ipl.c | 4 +++-
arch/s390/kvm/kvm-s390.c | 7 +++++--
drivers/s390/char/con3215.c | 5 ++++-
drivers/s390/char/con3270.c | 5 ++++-
drivers/s390/char/sclp_con.c | 4 +++-
drivers/s390/char/sclp_vt220.c | 4 +++-
drivers/s390/char/zcore.c | 4 +++-
7 files changed, 25 insertions(+), 8 deletions(-)
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index e2cc35775b99..3b1dceede55c 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -2069,7 +2069,9 @@ void __init setup_ipl(void)
/* We have no info to copy */
break;
}
- atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
+
+ if (atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb))
+ pr_warn("Panic notifier already registered\n");
}
void s390_reset_system(void)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c6257f625929..11b325724272 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -325,8 +325,11 @@ int kvm_arch_hardware_setup(void *opaque)
gmap_register_pte_notifier(&gmap_notifier);
vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier;
gmap_register_pte_notifier(&vsie_gmap_notifier);
- atomic_notifier_chain_register(&s390_epoch_delta_notifier,
- &kvm_clock_notifier);
+
+ if (atomic_notifier_chain_register(&s390_epoch_delta_notifier,
+ &kvm_clock_notifier))
+ pr_warn("KVM clock notifier already registered\n");
+
return 0;
}
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index f356607835d8..52b441b29fbc 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -865,7 +865,10 @@ static int __init con3215_init(void)
raw3215[0] = NULL;
return -ENODEV;
}
- atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
+
+ if (atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb))
+ pr_warn("Panic notifier already registered\n");
+
register_reboot_notifier(&on_reboot_nb);
register_console(&con3215);
return 0;
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index e4592890f20a..0ce25924fb18 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -641,7 +641,10 @@ con3270_init(void)
condev->cline->len = 0;
con3270_create_status(condev);
condev->input = alloc_string(&condev->freemem, 80);
- atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
+
+ if (atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb))
+ pr_warn("Panic notifier already registered\n");
+
register_reboot_notifier(&on_reboot_nb);
register_console(&con3270);
return 0;
diff --git a/drivers/s390/char/sclp_con.c b/drivers/s390/char/sclp_con.c
index de028868c6f4..42bb2ddaf791 100644
--- a/drivers/s390/char/sclp_con.c
+++ b/drivers/s390/char/sclp_con.c
@@ -285,7 +285,9 @@ sclp_console_init(void)
timer_setup(&sclp_con_timer, sclp_console_timeout, 0);
/* enable printk-access to this driver */
- atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
+ if (atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb))
+ pr_warn("Panic notifier already registered\n");
+
register_reboot_notifier(&on_reboot_nb);
register_console(&sclp_console);
return 0;
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index 29a6a0099f83..89cf7a7b0194 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/drivers/s390/char/sclp_vt220.c
@@ -836,7 +836,9 @@ sclp_vt220_con_init(void)
if (rc)
return rc;
/* Attach linux console */
- atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
+ if (atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb))
+ pr_warn("Panic notifier already registered\n");
+
register_reboot_notifier(&on_reboot_nb);
register_console(&sclp_vt220_console);
return 0;
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 3ba2d934a3e8..0bf28583a3b9 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -323,7 +323,9 @@ static int __init zcore_init(void)
NULL, &zcore_hsa_fops);
register_reboot_notifier(&zcore_reboot_notifier);
- atomic_notifier_chain_register(&panic_notifier_list, &zcore_on_panic_notifier);
+
+ if (atomic_notifier_chain_register(&panic_notifier_list, &zcore_on_panic_notifier))
+ pr_warn("Panic notifier already registered\n");
return 0;
fail:
--
2.29.2
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