On Thu, Oct 01, 2009 at 11:54:55AM +0530, Harinderjit Singh Sandhu wrote:
> -----------------------------------------------------------------------------------------------------------
> int ret;
> printk("initializing module\n");
> //free_irq(7,NULL);
> i = register_chrdev (SKELETON_MAJOR, SKELETON_NAME, &skeleton_fops);
> if (i != 0) return - EIO;
> //disable_irq(7);
> ret = request_irq (7, interrupt_handler,0,SKELETON_NAME ,NULL);
> printk("ret=%d\n",ret);
> //enable_irq(7);
> if(ret>=0){
> enable_irq(7);
> // outb_p(0x10, BASEPORT + 2);
> }
> else
> {
> printk("Not Working \n");
> }
> //printk("Generating interrupt \n");
>
> outb(0, BASEPORT);
> outb(255, BASEPORT);
> outb(0, BASEPORT);
> printk("Interrupt generated. You should see the handler-message\n");
>
> ---------------------------------------------------------------------------------------------------------
> when i insmod the module of which this is apart.
>
>
> i get the following output
>
> [ 1291.259646] initializing module
> [ 1291.259672] ret=0
> [ 1291.259679] ------------[ cut here ]------------
> [ 1291.259682] WARNING: at
> /build/buildd/linux-2.6.28/kernel/irq/manage.c:225 __enable_irq+0x30/0x70()
> [ 1291.259685] Unbalanced enable for IRQ 7
> [ 1291.259687] Modules linked in: skeleton(+) hid_bright usbhid rfkill_input
> i915 drm binfmt_misc ppdev bridge stp bnep lp parport arc4 ecb snd_hda_intel
> snd_pcm_oss snd_mixer_oss snd_pcm pcmcia snd_seq_dummy b43 snd_seq_oss
> snd_seq_midi snd_rawmidi mac80211 snd_seq_midi_event cfg80211 iTCO_wdt
> iTCO_vendor_support snd_seq snd_timer snd_seq_device yenta_socket
> rsrc_nonstatic ricoh_mmc sdhci_pci sdhci snd pcmcia_core led_class intel_agp
> agpgart soundcore snd_page_alloc pcspkr input_polldev serio_raw uvcvideo
> compat_ioctl32 videodev v4l1_compat video output ohci1394 ieee1394 8139too
> 8139cp mii ssb fbcon tileblit font bitblit softcursor
> [ 1291.259751] Pid: 4400, comm: insmod Not tainted 2.6.28-11-generic
> #42-Ubuntu
> [ 1291.259754] Call Trace:
> [ 1291.259760] [<c0139ab0>] warn_slowpath+0x60/0x80
> [ 1291.259765] [<c0181449>] ? register_handler_proc+0x119/0x130
> [ 1291.259773] [<c02cc3b8>] ? vsnprintf+0x378/0x5c0
> [ 1291.259778] [<c013a2f9>] ? release_console_sem+0x1c9/0x200
> [ 1291.259782] [<c017f570>] __enable_irq+0x30/0x70
> [ 1291.259786] [<c017f5ec>] enable_irq+0x3c/0x60
> [ 1291.259790] [<f7f9c000>] ? skeleton_init_module+0x0/0x96 [skeleton]
> [ 1291.259795] [<f7f9c078>] skeleton_init_module+0x78/0x96 [skeleton]
> [ 1291.259802] [<c010111e>] _stext+0x2e/0x170
> [ 1291.259807] [<c020c015>] ? sysfs_addrm_finish+0x15/0xf0
> [ 1291.259811] [<c020b7e3>] ? sysfs_add_one+0x13/0x50
> [ 1291.259814] [<c020b85f>] ? sysfs_addrm_start+0x3f/0xa0
> [ 1291.259820] [<c01a908c>] ? __vunmap+0x9c/0xe0
> [ 1291.259823] [<c01a908c>] ? __vunmap+0x9c/0xe0
> [ 1291.259832] [<c01a9121>] ? vfree+0x21/0x30
> [ 1291.259837] [<c0163f3a>] ? load_module+0x103a/0x1040
> [ 1291.259848] [<c0163fc8>] sys_init_module+0x88/0x1b0
> [ 1291.259853] [<c01bb5da>] ? sys_close+0x7a/0xc0
> [ 1291.259857] [<c0103f6b>] sysenter_do_call+0x12/0x2f
> [ 1291.259865] [<c0500000>] ? relay_hotcpu_callback+0x6d/0xbd
> [ 1291.259868] ---[ end trace cddcbfa519faa2fe ]---
> [ 1291.259870] Interrupt generated. You should see the handler-message
>
> and the message in the handler doesnt appear.
> i am unable to get what is the problem and how can this be solved.
>
> please help me out
Your irq handler is not working properly, please post the code for that.
Also, please follow the kernel coding style rules if you wish to have
other people review your code, otherwise it is very difficult for us to
do so.
good luck,
greg k-h
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