Device 'xxxx' does not have a release() function, it is broken and must be fixed.

卸载模块驱动是提示错误

Device 'xxxx' does not have a release() function, it is broken and must be fixed.

 

在使用platform bus来编写设备驱动时，定义的平台设备如下：

static struct platform_device buzzer_device = {
    .name        = "beep",
    .id        = -1,
    .dev = {
    }
    /* could list the /proc/iomem resources */
};

 

卸载模块驱动是提示错误：

WARNING: at drivers/base/core.c:143 device_release+0x70/0x84()

Device ‘beep’ does not have a release() function, it is broken and must be fixed.

 

在平台设备文件中添加.release的实现就OK了，如下：

static void platform_buzzer_release(struct device * dev)
{
    return ;
}


static struct platform_device buzzer_device = {
    .name        = "beep",
    .id        = -1,
    .dev = {
        .release = platform_buzzer_release,
    }
    /* could list the /proc/iomem resources */
};