interrupt handler not registered - linux-device-driver

Question

I work on dragonboard410c that has the kernel module wcn36xx which registers this way:
static const struct of_device_id wcn36xx_of_match[] = {
{ .compatible = "qcom,wcnss-wlan" },
{}
};
MODULE_DEVICE_TABLE(of, wcn36xx_of_match);
static struct platform_driver wcn36xx_driver = {
.probe = wcn36xx_probe,
.remove = wcn36xx_remove,
.driver = {
.name = "wcn36xx",
.of_match_table = wcn36xx_of_match,
},
};
module_platform_driver(wcn36xx_driver);
I want to write my own kernel module that also registers to the same device , I have the code:
static const struct of_device_id my_interrupt_of_match[] = {
{ .compatible = "qcom,wcnss-wlan" },
{}
};
MODULE_DEVICE_TABLE(of, lab2_interrupt_of_match);
static struct platform_driver my_driver = {
.driver= {
.name = "my_interrupt",
.of_match_table = my_interrupt_of_match,
},
.probe = my_probe,
.remove = my_remove,
};
In the init function I register my driver:
int err = platform_driver_register(&my_driver);
But my probe function isn't called.
my module is automatically loaded on boot and the init function is called.
I build my module in a directory external to the kernel code and I put lab2_interrupt.ko on the board in the same directory as wcn36xx.ko:
/lib/modules/4.4.23-linaro-lt-qcom/kernel/drivers/net/wireless/ath/wcn36xx/

Answer 1

I guess that's because the corresponding platform device is already registered with the original wcn36xx_driver platform driver.
You should either disable it in your kernel build, or if it is built as a module, you could unload it with modprobe -r wcn36xx before loading your lab2_interrupt driver, or you could even blacklist it completely to prevent it to be loaded in the first place by adding such a line to /etc/modprobe.d/blacklist
blacklist wcn36xx