PATCH: ecng for 6.x and 7.x

[Nate Lawson]

Mikael Ikivesi wrote:
> Note still:  If I try to suspend machine I get kernel panic. I dont know if it 
> was you patch or some other update, but before I got only messages and bounce 
> back to system without crashing. Because of the updates I cannot now access 
> the messages but if I remember correctly they were something about:
> device physically ejected? and they had something to do with cardbus if I 
> remember correctly...
> ...sorry for being so vague!
> 
> 
> BUT about that panic I can be more precise :)
> 
> 
> acpi_button0: sleep button pressed
> Kernel page fault with the following non-sleepable locks held:
> exclusive sleep mutex ACPI global lock r = 0 (0xffffffff808ac4a0) locked 
> @ /usr/src/sys/dev/acpica/acpi.c:2222
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> witness_warn() at witness_warn+0x248
> trap() at trap+0x25e
> calltrap() at calltrap+0x8
> --- trap 0xc, rip = 0xffffffff801d9cf4, rsp = 0xffffffff9ed4aa00, rbp = 
> 0xffffffff9ed4aa30 ---
> acpi_AckSleepState() at acpi_AckSleepState+0x34
> devfs_ioctl_f() at devfs_ioctl_f+0x6d
> kern_ioctl() at kern_ioctl+0xa3
> ioctl() at ioctl+0xf9
> syscall() at syscall+0x1ce
> Xfast_syscall() at Xfast_syscall+0xab
> --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x8007187ec, rsp = 
> 0x7fffffffecd8, rbp = 0x7fffffffee50 ---
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address	= 0x18
> fault code		= supervisor read data, page not present
> instruction pointer	= 0x8:0xffffffff801d9cf4
> stack pointer	        = 0x10:0xffffffff9ed4aa00
> frame pointer	        = 0x10:0xffffffff9ed4aa30
> code segment		= base 0x0, limit 0xfffff, type 0x1b
> 			= DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags	= interrupt enabled, resume, IOPL = 0
> current process		= 748 (acpiconf)

Try the attached patch.  It will reject suspend requests while still
allowing power-off.  This will have to be this way until amd64
suspend/resume is implemented.

-Nate
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