linux-kernel - [PATCH] powerpc/44x/uic: Consolidate chained IRQ handler install/remove

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Message-Id: <20260119063507.940782-1-nichen@iscas.ac.cn>
Date: Mon, 19 Jan 2026 14:35:07 +0800
From: Chen Ni <nichen@...as.ac.cn>
To: maddy@...ux.ibm.com,
	mpe@...erman.id.au,
	npiggin@...il.com,
	chleroy@...nel.org,
	tglx@...nel.org,
	jirislaby@...nel.org
Cc: linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Chen Ni <nichen@...as.ac.cn>
Subject: [PATCH] powerpc/44x/uic: Consolidate chained IRQ handler install/remove

The driver currently sets the handler data and the chained handler in
two separate steps. This creates a theoretical race window where an
interrupt could fire after the handler is set but before the data is
assigned, leading to a NULL pointer dereference.

Replace the two calls with irq_set_chained_handler_and_data() to set
both the handler and its data atomically under the irq_desc->lock.

Signed-off-by: Chen Ni <nichen@...as.ac.cn>
---
 arch/powerpc/platforms/44x/uic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/44x/uic.c b/arch/powerpc/platforms/44x/uic.c
index 85daf841fd3f..50ce4a77ca94 100644
--- a/arch/powerpc/platforms/44x/uic.c
+++ b/arch/powerpc/platforms/44x/uic.c
@@ -309,8 +309,8 @@ void __init uic_init_tree(void)
 
 			cascade_virq = irq_of_parse_and_map(np, 0);
 
-			irq_set_handler_data(cascade_virq, uic);
-			irq_set_chained_handler(cascade_virq, uic_irq_cascade);
+			irq_set_chained_handler_and_data(cascade_virq,
+							 uic_irq_cascade, uic);
 
 			/* FIXME: setup critical cascade?? */
 		}
-- 
2.25.1