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    SubjectRe: 2.6.33.5 rt23: sleeping function called from invalid context
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    On Thu, 2010-07-08 at 10:37 -0700, john stultz wrote:
    > On Wed, 2010-07-07 at 20:54 -0700, Fernando Lopez-Lezcano wrote:
    > > After a suspend/wake up cycle, just after upgrading to fc12 (I did not
    > > see this with the same basic kernel - that is, compiled from the same
    > > source + patches - under fc11).
    > >
    > > BUG: sleeping function called from invalid context at
    > > kernel/rtmutex.c:684
    > > pcnt: 0 0 in_atomic(): 0, irqs_disabled(): 1, pid: 10582, name:
    > > pm-suspend
    > > Pid: 10582, comm: pm-suspend Not tainted
    > > 2.6.33.5-120.rt23.1.fc11.ccrma.i686.rtPAE #1
    > > Call Trace:
    > > [<c042eced>] __might_sleep+0xcc/0xd4
    > > [<c0464f57>] rt_spin_lock_fastlock.clone.1+0x26/0x5f
    > > [<c0792862>] rt_spin_lock+0x8/0xa
    > > [<c040dddc>] read_persistent_clock+0x11/0x30
    > > [<c045d1de>] timekeeping_suspend+0xe/0x4e
    > > [<c0640c9e>] sysdev_suspend+0x15c/0x356
    > > [<c0792906>] ? _mutex_unlock+0x8/0xa
    > > [<c046afc1>] suspend_devices_and_enter+0xea/0x17f
    >
    > Huh. Looks like the lock protecting the RTC/CMOS might need to be
    > converted to a raw spinlock, since suspend/resume is probably done with
    > irqs off.

    Oof. The rtc_lock is used all over the place. Not sure if we really want
    to convert it to a raw_spinlock.

    However, sysdev_suspend() wants interrupts off on all the .suspend
    calls. I'm surprised we haven't hit this issue with more drivers. Maybe
    no one is testing suspend w/ -rt? Or am I just missing an obvious
    solution?

    Thomas, any thoughts on this?

    thanks
    -john





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