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soc: fsl: qe: qe_ports_ic: Consolidate chained IRQ handler install/remove

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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@iscas.ac.cn>
Link: https://lore.kernel.org/r/20260119055715.889001-1-nichen@iscas.ac.cn
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
This commit is contained in:
Chen Ni 2026-01-19 13:57:15 +08:00 committed by Christophe Leroy (CS GROUP)
parent 0d069bb381
commit 65d5727645
1 changed files with 1 additions and 2 deletions
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3
drivers/soc/fsl/qe/qe_ports_ic.c
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@ -114,8 +114,7 @@ static int qepic_probe(struct platform_device *pdev)
if (!data->host)
return -ENODEV;
irq_set_handler_data(irq, data);
irq_set_chained_handler(irq, qepic_cascade);
irq_set_chained_handler_and_data(irq, qepic_cascade, data);
return 0;
}