@@ -292,13 +292,14 @@ static int rtc_probe(struct platform_device *pdev)
goto err_rtc1_iounmap;
}
- rtc = devm_rtc_device_register(&pdev->dev, rtc_name, &vr41xx_rtc_ops,
- THIS_MODULE);
+ rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc)) {
retval = PTR_ERR(rtc);
goto err_iounmap_all;
}
+ rtc->ops = &vr41xx_rtc_ops;
+
rtc->max_user_freq = MAX_PERIODIC_RATE;
spin_lock_irq(&rtc_lock);
@@ -340,6 +341,10 @@ static int rtc_probe(struct platform_device *pdev)
dev_info(&pdev->dev, "Real Time Clock of NEC VR4100 series\n");
+ retval = rtc_register_device(rtc);
+ if (retval)
+ goto err_iounmap_all;
+
return 0;
err_iounmap_all:
The probe function is not allowed to fail after the RTC is registered because the following may happen: CPU0: CPU1: sys_load_module() do_init_module() do_one_initcall() cmos_do_probe() rtc_device_register() __register_chrdev() cdev->owner = struct module* open("/dev/rtc0") rtc_device_unregister() module_put() free_module() module_free(mod->module_core) /* struct module *module is now freed */ chrdev_open() spin_lock(cdev_lock) cdev_get() try_module_get() module_is_live() /* dereferences already freed struct module* */ Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> --- drivers/rtc/rtc-vr41xx.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)