키보드 인터럽트 처리를위한 Linux 장치 드라이버 오류

Question

커널 모드에서 키보드 인터럽트 처리를 프로그래밍하는 방법을 배우는 동안 아래의 예를 따르면 커널 공간에 드라이버를로드 한 후 이러한 오류가 발생합니다.

#include <linux/kernel.h> 
#include <linux/module.h> 
#include <linux/sched.h> 
#include <linux/workqueue.h> 
#include <linux/interrupt.h> 
#include <asm/io.h> 

MODULE_LICENSE("GPL"); 
irqreturn_t irq_handler(int irq, void *dev_id, struct pt_regs *regs) { 
    static unsigned char scancode, status; 
    status = inb(0x64); 
    scancode = inb(0x60); 
    switch (scancode) 
    { 
    case 0x01: printk (KERN_INFO "! You pressed Esc ...\n"); 
      break; 
    case 0x3B: printk (KERN_INFO "! You pressed F1 ...\n"); 
      break; 
    case 0x3C: printk (KERN_INFO "! You pressed F2 ...\n"); 
      break; 
    default: break; 
    } 
    return IRQ_HANDLED; 
} 
static int __init irq_ex_init(void) { 
    printk (KERN_INFO "DEVICE OPEN...\n"); 
    free_irq(1,NULL); 
    return request_irq (1,(irq_handler_t)irq_handler,IRQF_SHARED,"test_keyboard_irq_handler",(void*)(irq_handler)); 
} 
static void __exit irq_ex_exit(void) { 
    printk (KERN_INFO "!DEVICE CLOSE...\n"); 
    free_irq(1,(void*)(irq_handler)); 
} 
module_init(irq_ex_init); 
module_exit(irq_ex_exit); 

언로드도 잘 작동하지만 insmod 로딩 한 후 오류가 발생합니다. 누군가가 설명 할 수 있는지 궁금 해서요. 우분투 16.04.2 LTS를 사용합니다.

Dec 5 12:02:01 iman kernel: [ 502.506500] ------------[ cut here ]------------ 
Dec 5 12:02:01 iman kernel: [ 502.506510] WARNING: CPU: 1 PID: 4240 at /build/linux-hwe-zOpU13/linux-hwe-4.10.0/kernel/irq/manage.c:1484 __free_irq+0xa4/0x290 
Dec 5 12:02:01 iman kernel: [ 502.506511] Trying to free already-free IRQ 1 
Dec 5 12:02:01 iman kernel: [ 502.506512] Modules linked in: DDriver(OE+) Driver(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat libcrc32c nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables snd_hda_codec_hdmi eeepc_wmi asus_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cryptd intel_cstate intel_rapl_perf joydev input_leds snd_seq_midi snd_seq_midi_event snd_hda_codec_realtek snd_hda_codec_generic snd_rawmidi snd_hda_intel snd_hda_codec lpc_ich snd_seq snd_hda_core snd_hwdep snd_seq_device snd_pcm snd_timer snd soundcore mei_me shpchp mei mac_hid kvm binfmt_misc 
Dec 5 12:02:01 iman kernel: [ 502.506560] irqbypass parport_pc ppdev lp parport autofs4 hid_cherry hid_generic usbhid hid nouveau mxm_wmi i2c_algo_bit ttm drm_kms_helper ahci syscopyarea libahci sysfillrect r8169 sysimgblt mii fb_sys_fops drm wmi fjes video [last unloaded: DDriver] 
Dec 5 12:02:01 iman kernel: [ 502.506584] CPU: 1 PID: 4240 Comm: insmod Tainted: G  W OE 4.10.0-40-generiC#44~16.04.1-Ubuntu 
Dec 5 12:02:01 iman kernel: [ 502.506585] Hardware name: ASUSTeK Computer INC. V-P8H67E/V-P8H67E, BIOS 1401 12/12/2011 
Dec 5 12:02:01 iman kernel: [ 502.506586] Call Trace: 
Dec 5 12:02:01 iman kernel: [ 502.506593] dump_stack+0x63/0x90 
Dec 5 12:02:01 iman kernel: [ 502.506596] __warn+0xcb/0xf0 
Dec 5 12:02:01 iman kernel: [ 502.506598] warn_slowpath_fmt+0x5f/0x80 
Dec 5 12:02:01 iman kernel: [ 502.506602] __free_irq+0xa4/0x290 
Dec 5 12:02:01 iman kernel: [ 502.506604] free_irq+0x39/0x90 
Dec 5 12:02:01 iman kernel: [ 502.506607] ? 0xffffffffc0183000 
Dec 5 12:02:01 iman kernel: [ 502.506611] irq_ex_init+0x26/0x1000 [DDriver] 
Dec 5 12:02:01 iman kernel: [ 502.506614] do_one_initcall+0x53/0x1c0 
Dec 5 12:02:01 iman kernel: [ 502.506619] ? kmem_cache_alloc_trace+0x152/0x1c0 
Dec 5 12:02:01 iman kernel: [ 502.506624] do_init_module+0x5f/0x1ff 
Dec 5 12:02:01 iman kernel: [ 502.506629] load_module+0x1825/0x1bf0 
Dec 5 12:02:01 iman kernel: [ 502.506632] ? __symbol_put+0x60/0x60 
Dec 5 12:02:01 iman kernel: [ 502.506636] ? ima_post_read_file+0x7d/0xa0 
Dec 5 12:02:01 iman kernel: [ 502.506640] ? security_kernel_post_read_file+0x6b/0x80 
Dec 5 12:02:01 iman kernel: [ 502.506644] SYSC_finit_module+0xdf/0x110 
Dec 5 12:02:01 iman kernel: [ 502.506648] SyS_finit_module+0xe/0x10 
Dec 5 12:02:01 iman kernel: [ 502.506652] entry_SYSCALL_64_fastpath+0x1e/0xad 
Dec 5 12:02:01 iman kernel: [ 502.506655] RIP: 0033:0x7f0f6a2a3499 
Dec 5 12:02:01 iman kernel: [ 502.506656] RSP: 002b:00007fff1b8c96f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000139 
Dec 5 12:02:01 iman kernel: [ 502.506659] RAX: ffffffffffffffda RBX: 00007f0f6a566b20 RCX: 00007f0f6a2a3499 
Dec 5 12:02:01 iman kernel: [ 502.506661] RDX: 0000000000000000 RSI: 000055649bd65246 RDI: 0000000000000003 
Dec 5 12:02:01 iman kernel: [ 502.506663] RBP: 0000000000001011 R08: 0000000000000000 R09: 00007f0f6a568ea0 
Dec 5 12:02:01 iman kernel: [ 502.506664] R10: 0000000000000003 R11: 0000000000000202 R12: 00007f0f6a566b78 
Dec 5 12:02:01 iman kernel: [ 502.506665] R13: 00007f0f6a566b78 R14: 000000000000270f R15: 00007f0f6a5671a8 
Dec 5 12:02:01 iman kernel: [ 502.506668] ---[ end trace 4b89a13407b08cea ]--- 

Answer 1

free_irq()이 NULL 호출해서는 안됩니다, 당신은 당신이 IRQ 등록시 사용한 고유의 핸들러를 통과해야한다. register_irq() 호출이 동일한 모듈에서했다 후에는 초기화 함수에서 IRQ를 해제해서는 안

free_irq(1,(void*)(irq_handler)); //In your case

는 free_irq()를 호출해야합니다.

init 함수에서 free_irq(1,(void*)(irq_handler));을 호출하더라도 핸들러가 이전에 등록되지 않았으므로 커널이 오염됩니다.

제거 할 처리기를 커널에 알려줘야합니다.

어떤 모듈이 이미 같은 IRQ를 등록했는지 모르기 때문에 코드에서 이미 구현 한 모듈에서 공유 IRQ를 사용하는 것이 논리입니다.

즉, 초기화 기능에서 IRQ를 해제하지 마십시오.