Possible suspend/resume regression in .32-rc?

[Haojian Zhuang]

On Mon, Nov 2, 2009 at 6:51 AM, Pavel Machek <pavel at ucw.cz> wrote:
> On Mon 2009-11-02 06:48:28, Haojian Zhuang wrote:
>> On Mon, Nov 2, 2009 at 5:38 AM, Pavel Machek <pavel at ucw.cz> wrote:
>> > On Mon 2009-11-02 05:22:30, Haojian Zhuang wrote:
>> >> On Sun, Nov 1, 2009 at 6:03 PM, Pavel Machek <pavel at ucw.cz> wrote:
>> >>
>> >> Em, it's not caused by the IRQ patch.
>> >>
>> >> The kernel is blocked in resume path. When console is resumed, IRQ is
>> >> already disabled and system is blocked. Actually, IRQ shouldn't be
>> >> disabled at here. Up to now, I only find which patch will cause this
>> >> issue. But I can't find the best solution on it. The patch with issue
>> >> is pasted in below.
>> >>
>> >> So this issue is only occused when console suspend is enabled. If you
>> >> enable no_console_suspend in command, you won't meet this issue. It
>> >> seems that it's caused by removing termios setting in
>> >> uart_resume_port() in the below patch. If I add these code back, the
>> >> issue doesn't occur any more.
>> >
>> > Given that it hangs very early, in arch_suspend_enable_irqs() (see my
>> > other mail), I don't trust your analysis.
>> >
>> > I'm not using serial console on spitz, and I have never had successful
>> > resume with the patch applied.
>>
>> It seems that we're talking on different issue with similar symptom.
>> Please check my test method. While I'm testing suspend with devices
>> level, kernel is blocked in console resume. In this level, it won't
>> call arch_suspend_enable_irqs(). This function call is only invoked in
>> processor level or below.
>
> For me, everything but real suspend works. I do _not_ have serial
> console for spitz.
>
>> Up to now, I can't reproduce the issue you're talking on my platform
>> yet. I'll check this issue continuously. I also want to know your
>> hardware information.
>
> Spitz, aka Sharp Zaurus c3000.
>

I see. You can chech my patch in below. I need to save IPRs in suspend
resume routine.

Thanks
Haojian