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Message-Id: <20260119060450.889119-1-nichen@iscas.ac.cn> Date: Mon, 19 Jan 2026 14:04:50 +0800 From: Chen Ni <nichen@...as.ac.cn> To: agust@...x.de, maddy@...ux.ibm.com, mpe@...erman.id.au, npiggin@...il.com, chleroy@...nel.org, jirislaby@...nel.org, tglx@...nel.org Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, Chen Ni <nichen@...as.ac.cn> Subject: [PATCH] powerpc/52xx/media5200: 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/52xx/media5200.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/52xx/media5200.c b/arch/powerpc/platforms/52xx/media5200.c index bc7f83cfec1d..c20ac8010f6d 100644 --- a/arch/powerpc/platforms/52xx/media5200.c +++ b/arch/powerpc/platforms/52xx/media5200.c @@ -176,8 +176,8 @@ static void __init media5200_init_irq(void) of_node_put(fpga_np); - irq_set_handler_data(cascade_virq, &media5200_irq); - irq_set_chained_handler(cascade_virq, media5200_irq_cascade); + irq_set_chained_handler_and_data(cascade_virq, media5200_irq_cascade, + &media5200_irq); return; -- 2.25.1
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