Linux驱动之内核加载模块过程分析

printk(KERN_WARNING'%s: '%s'->init suspiciously returned %d, it should follow 0/-E conventionn''%s: loading module anyway...n',__func__,mod->name, ret,__func__);

dump_stack();

}

//模块初始化完成，更改状态，通知内核

mod->state = MODULE_STATE_LIVE;

blocking_notifier_call_chain(&module_notify_list,MODULE_STATE_LIVE, mod);

if (current->flags & PF_USED_ASYNC)

async_synchronize_full();

mutex_lock(&module_mutex);

/* Drop initial reference. */

module_put(mod);

rim_init_extable(mod);

#ifdef CONFIG_KALLSYMS

mod->num_symtab = mod->core_num_syms;

mod->symtab = mod->core_symtab;

mod->strtab = mod->core_strtab;

#endif

//释放初始化部分空间，这部分只是在初始化有效，初始化结束回收资源，清空

unset_module_init_ro_nx(mod);

module_free(mod, mod->module_init);

mod->module_init = NULL;

mod->init_size = 0;

mod->init_ro_size = 0;

mod->init_text_size = 0;

mutex_unlock(&module_mutex);

wake_up_all(&module_wq);

return 0;

}

int __init_or_module do_one_initcall(initcall_t fn)

{

int count = preempt_count();

int ret;

char msgbuf[64];

if (initcall_debug)

ret = do_one_initcall_debug(fn);

else

ret = fn();//执行模块的init_module函数

msgbuf[0] = 0;

if (preempt_count() != count) {

sprintf(msgbuf, 'preemption imbalance ');

preempt_count() = count;

}

if (irqs_disabled()) {

strlcat(msgbuf, 'disabled interrupts ', sizeof(msgbuf));

local_irq_enable();

}

WARN(msgbuf[0], 'initcall %pF returned with %sn', fn, msgbuf);

return ret;

}