linux-kernel - [tip: irq/core] irqchip/sifive-plic: Fix syscore registration for multi-socket systems

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Date:   Fri, 27 Oct 2023 08:17:35 -0000
From:   "tip-bot2 for Anup Patel" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Anup Patel <apatel@...tanamicro.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/core] irqchip/sifive-plic: Fix syscore registration for
 multi-socket systems

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     f99b926f6543faeadba1b4524d8dc9c102489135
Gitweb:        https://git.kernel.org/tip/f99b926f6543faeadba1b4524d8dc9c102489135
Author:        Anup Patel <apatel@...tanamicro.com>
AuthorDate:    Wed, 25 Oct 2023 19:58:20 +05:30
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Fri, 27 Oct 2023 10:09:15 +02:00

irqchip/sifive-plic: Fix syscore registration for multi-socket systems

Multi-socket systems have a separate PLIC in each socket, so __plic_init()
is invoked for each PLIC. __plic_init() registers syscore operations, which
obviously fails on the second invocation.

Move it into the already existing condition for installing the CPU hotplug
state so it is only invoked once when the first PLIC is initialized.

[ tglx: Massaged changelog ]

Fixes: e80f0b6a2cf3 ("irqchip/irq-sifive-plic: Add syscore callbacks for hibernation")
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20231025142820.390238-4-apatel@ventanamicro.com

---
 drivers/irqchip/irq-sifive-plic.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index e148490..5b7bc4f 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -532,17 +532,18 @@ done:
 	}
 
 	/*
-	 * We can have multiple PLIC instances so setup cpuhp state only
-	 * when context handler for current/boot CPU is present.
+	 * We can have multiple PLIC instances so setup cpuhp state
+	 * and register syscore operations only when context handler
+	 * for current/boot CPU is present.
 	 */
 	handler = this_cpu_ptr(&plic_handlers);
 	if (handler->present && !plic_cpuhp_setup_done) {
 		cpuhp_setup_state(CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
 				  "irqchip/sifive/plic:starting",
 				  plic_starting_cpu, plic_dying_cpu);
+		register_syscore_ops(&plic_irq_syscore_ops);
 		plic_cpuhp_setup_done = true;
 	}
-	register_syscore_ops(&plic_irq_syscore_ops);
 
 	pr_info("%pOFP: mapped %d interrupts with %d handlers for"
 		" %d contexts.\n", node, nr_irqs, nr_handlers, nr_contexts);