hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IC4H9T -------------------------------- In function vtimer_mbigen_set_regs, variable dereferenced before check and it caused a warning: drivers/irqchip/irq-mbigen.c:746 vtimer_mbigen_set_regs() warn: variable dereferenced before check 'mgn_chip' (see line 737) To fix this, move the null-check logic before access base member in mgn_chip. Fixes: b8b70fe6bcf0 ("mbigen: Sets the regs related to vtimer irqbypass") Signed-off-by: Bowen You <youbowen2@huawei.com> --- drivers/irqchip/irq-mbigen.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c index 4e603fa73c33..56954d959629 100644 --- a/drivers/irqchip/irq-mbigen.c +++ b/drivers/irqchip/irq-mbigen.c @@ -719,6 +719,9 @@ static int vtimer_mbigen_set_regs(struct platform_device *pdev) if (!vtimer_irqbypass) return 0; + if (!mgn_chip) + return -ENOMEM; + addr = mgn_chip->base + MBIGEN_CTLR_OFFSET; val = readl_relaxed(addr); mpidr_aff3 = (val & MBIGEN_AFF3_MASK) >> MBIGEN_AFF3_SHIFT; @@ -728,8 +731,6 @@ static int vtimer_mbigen_set_regs(struct platform_device *pdev) } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mgn_chip) - return -ENOMEM; if (res->start == CHIP0_TA_MBIGEN_PHY_BASE) { addr = ioremap(CHIP0_TA_PERI_PHY_BASE, 4); -- 2.34.1