[PATCH v5 1/2] irqchip/riscv-aplic: do not mark the syscore registered flag ro_after_init

[Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>]

aplic_syscore_registered is marked __ro_after_init, but it is written
from aplic_probe(), which can run after init. With MSI, aplic_msi_setup()
returns -EPROBE_DEFER while the MSI parent (IMSIC) is not ready, so the
later successful probe writes the flag after it has been made read-only.
That write faults.

Drop the __ro_after_init annotation so the flag stays writable.

Fixes: b330fbfd34d7 ("irqchip/riscv-aplic: Register syscore operations only once")
Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
---
 drivers/irqchip/irq-riscv-aplic-main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-aplic-main.c b/drivers/irqchip/irq-riscv-aplic-main.c
index d9afb6ae98cf..5369078f3d00 100644
--- a/drivers/irqchip/irq-riscv-aplic-main.c
+++ b/drivers/irqchip/irq-riscv-aplic-main.c
@@ -116,7 +116,11 @@ static struct syscore aplic_syscore = {
 	.ops = &aplic_syscore_ops,
 };
 
-static bool aplic_syscore_registered __ro_after_init;
+/*
+ * Not __ro_after_init: probe can be deferred (e.g. MSI mode waiting for the
+ * IMSIC) and complete after the init memory is made read-only.
+ */
+static bool aplic_syscore_registered;
 
 static void aplic_syscore_init(void)
 {

-- 
2.43.0