[PATCH] irqchip/irq-msi-lib: Check for NULL ops in msi_lib_irq_domain_select
Maxime Chevallier
maxime.chevallier at bootlin.com
Fri Aug 23 03:07:12 PDT 2024
The irq_domain passed to msi_lib_irq_domain_select() may not have any
msi_parent_ops set. Move the test for NULL ops before the first use of
that pointer.
This was found on a MacchiatoBin (Marvell Armada 8K SoC), which uses the
irq-mvebu-sei driver.
Fixes: 72e257c6f058 ("irqchip: Provide irq-msi-lib")
Closes: https://lore.kernel.org/all/20240821165034.1af97bad@fedora-3.home/
Signed-off-by: Maxime Chevallier <maxime.chevallier at bootlin.com>
---
drivers/irqchip/irq-msi-lib.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c
index b5b90003311a..d8e29fc0d406 100644
--- a/drivers/irqchip/irq-msi-lib.c
+++ b/drivers/irqchip/irq-msi-lib.c
@@ -128,6 +128,9 @@ int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
const struct msi_parent_ops *ops = d->msi_parent_ops;
u32 busmask = BIT(bus_token);
+ if (!ops)
+ return 0;
+
if (fwspec->fwnode != d->fwnode || fwspec->param_count != 0)
return 0;
@@ -135,6 +138,6 @@ int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
if (bus_token == ops->bus_select_token)
return 1;
- return ops && !!(ops->bus_select_mask & busmask);
+ return !!(ops->bus_select_mask & busmask);
}
EXPORT_SYMBOL_GPL(msi_lib_irq_domain_select);
--
2.45.2
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