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What is unbalanced IRQ?

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# 1  
Old 11-12-2010
Question What is unbalanced IRQ?
------------[ cut here ]------------
WARNING: at kernel/irq/manage.c:225 __enable_irq+0x3b/0x57()
Unbalanced enable for IRQ 4
Modules linked in: svsknfdrvr [last unloaded: osal_linux]
Pid: 634, comm: ash Tainted: G W 2.6.28 #1
Call Trace:
[<c011a7f9>] warn_slowpath+0x76/0x8d
[<c012fac8>] profile_tick+0x2d/0x57
[<c011ed72>] irq_exit+0x32/0x34
[<c010f22c>] smp_apic_timer_interrupt+0x41/0x71
[<c01039ec>] apic_timer_interrupt+0x28/0x30
[<c011b2b4>] vprintk+0x1d3/0x300
[<c013a2af>] __setup_irq+0x11c/0x1f2
[<c013a177>] __enable_irq+0x3b/0x57
[<c013a506>] enable_irq+0x37/0x54
[<c68c9156>] svsknfdrvr_open+0x5e/0x65 [svsknfdrvr]
[<c016440a>] chrdev_open+0xce/0x1a4
[<c016433c>] chrdev_open+0x0/0x1a4
[<c01602f7>] __dentry_open+0xcc/0x23a
[<c016049a>] nameidata_to_filp+0x35/0x3f
[<c016b3c5>] do_filp_open+0x16f/0x6ef
[<c0278fd5>] tty_write+0x1a2/0x1c9
[<c0160128>] do_sys_open+0x42/0xcb
[<c0160201>] sys_open+0x23/0x2a
[<c0102e71>] sysenter_do_call+0x12/0x25
---[ end trace 4eaa2a86a8e2da22 ]---
# 2  
Old 11-12-2010
It means that __enable_irq() (see ../kernel/irq/message.c) detected that depth field in the irq_desc structure has a value of 0 rather than the expected value of 1 or more. This can be caused by a spurious IRQ.
# 3  
Old 11-12-2010
Spurious?

---------- Post updated at 12:23 PM ---------- Previous update was at 11:51 AM ----------

How i do i check if an irq is already enabled?
# 4  
Old 11-12-2010
spurious, i.e. unexpected, unprovoked, or shouldn't have happened in general.
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