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irqchip/imx-irqsteer: Fix of_property_read_u32() error handling

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gcc points out that irqs_num is not initialized when of_property_read_u32()
is an empty stub function:

                 Included from drivers/irqchip/irq-imx-irqsteer.c:7:
drivers/irqchip/irq-imx-irqsteer.c: In function 'imx_irqsteer_probe':
include/uapi/linux/kernel.h:13:49: error: 'irqs_num' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The same can actually happen with CONFIG_OF=y as well, though we don't
get a warning then.

Add error checking here that lets the code deal with missing or
invalid properties as well as avoid the warning.

Fixes: 28528fca4908 ("irqchip/imx-irqsteer: Add multi output interrupts support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Arnd Bergmann 2019-03-04 21:02:18 +01:00 committed by Marc Zyngier
parent 28528fca49
commit 7d3a5eb78e
1 changed files with 6 additions and 2 deletions
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8
drivers/irqchip/irq-imx-irqsteer.c
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@ -169,8 +169,12 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
raw_spin_lock_init(&data->lock);
of_property_read_u32(np, "fsl,num-irqs", &irqs_num);
of_property_read_u32(np, "fsl,channel", &data->channel);
ret = of_property_read_u32(np, "fsl,num-irqs", &irqs_num);
if (ret)
return ret;
ret = of_property_read_u32(np, "fsl,channel", &data->channel);
if (ret)
return ret;
/*
* There is one output irq for each group of 64 inputs.