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    SubjectRe: [2.5.75] S3 and S4
    Hi!

    > > > > > Suspending devices
    > > > > > Badness in local_bh_enable at kernel/softirq.c:113
    > > > > > Call Trace:
    > > > > > [<c0130078>] local_bh_enable+0x88/0x90
    > > > > > [<f0a44fa4>] e100_do_wol+0x14/0x60 [e100]
    > > > > > [<f0a461ee>] e100_suspend+0x3e/0xa0 [e100]
    > > > > > [<f0a461b0>] e100_suspend+0x0/0xa0 [e100]
    > > > > > [<c0212577>] pci_device_suspend+0x47/0x70
    > > > > > [<c029bc99>] device_suspend+0xd9/0x100
    > > > > > [<c023e047>] acpi_system_save_state+0x42/0x8c
    > > > > > [<c023e153>] acpi_suspend+0x5e/0xb3
    > > > > > [<c023e394>] acpi_system_write_sleep+0xe3/0x132
    > > > > > [<c0177de0>] filp_open+0x60/0x70
    > > > > > [<c017952d>] vfs_write+0xad/0x120
    > > > > > [<c017963f>] sys_write+0x3f/0x60
    > > > > > [<c010b10f>] syscall_call+0x7/0xb
    > > > > >
    > > > >
    > > > > If e100. You have the hardware...
    > > >
    > > > No, it's acpi_system_save_state() illegally calling device_suspend() under
    > > > local_irq_disable().
    > >
    > > Oops, I failed to see this is S3.
    > >
    > > I can see that device_suspend( ..., SUSPEND_POWER_DOWN) is called with
    > > interrupts disabled. But thats okay: (driver.txt) All calls are made
    > > with interrupts enabled, except for the SUSPEND_POWER_DOWN level.
    >
    > OK, it's an e100 bug then. Not allowed to sleep or do spin_unloch_bh() in
    > device_suspend( ..., SUSPEND_POWER_DOWN).
    >
    > That's a fairly awkward restriction.

    Actually, its not. Some phase with interrupts off is needed for
    devices such as interrupt controller. Fix is very simple: move the
    e100 suspend from SUSPEND_POWER_DOWN to some other level.

    Pavel

    --
    When do you have a heart between your knees?
    [Johanka's followup: and *two* hearts?]
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