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If an interrupt > arrives in that window: > > - mx3_gpio_irq_handler() calls generic_handle_domain_irq() with > port->domain still NULL. > - mx2_gpio_irq_handler() walks mxc_gpio_ports, but the port has not > been added to the list yet. > > Additionally, if any of the subsequent probe steps > (gpio_generic_chip_init(), devm_gpiochip_add_data(), > irq_domain_create_legacy(), or mxc_gpio_init_gc()) fail, the error > paths never unregister the chained handler, leaving a dangling handler > that points at freed memory. > > Move the handler installation after all its dependencies are ready and > after list_add_tail(), so the handler is never live while the data > structures it touches are incomplete, and is never installed if probe > fails. > > Fixes: 5f6d1998adeb ("gpio: mxc: release the parent IRQ in runtime suspend") > Assisted-by: LLM > Signed-off-by: Peng Fan > --- Reviewed-by: Frank Li > drivers/gpio/gpio-mxc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c > index 7e2690d92df6..e05f276a50e8 100644 > --- a/drivers/gpio/gpio-mxc.c > +++ b/drivers/gpio/gpio-mxc.c > @@ -474,8 +474,6 @@ static int mxc_gpio_probe(struct platform_device *pdev) > } else > port->mx_irq_handler = mx3_gpio_irq_handler; > > - mxc_update_irq_chained_handler(port, true); > - > config.dev = &pdev->dev; > config.sz = 4; > config.dat = port->base + GPIO_PSR; > @@ -525,6 +523,8 @@ static int mxc_gpio_probe(struct platform_device *pdev) > > list_add_tail(&port->node, &mxc_gpio_ports); > > + mxc_update_irq_chained_handler(port, true); > + > platform_set_drvdata(pdev, port); > pm_runtime_put_autosuspend(&pdev->dev); > > > -- > 2.51.0 > >