Re: [2.6.2-rc1] sleep called from invalid context (8250/ACPI related?)

From: Andrew Morton (akpm_at_osdl.org)
Date: 01/21/04

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    Date:	Wed, 21 Jan 2004 13:36:52 -0800
To: Rui Saraiva <rmps@joel.ist.utl.pt>

    Rui Saraiva <rmps@joel.ist.utl.pt> wrote:
    >
    > --------------------------------------------------------------------------------|
    > Hello,
    >
    > I've found this message in my logs while investigating some kernel Oops
    > (in other message). If you need more info, please ask.
    >
    > Regards,
    > Rui Saraiva
    >
    >
    > Debug: sleeping function called from invalid context at include/asm/semaphore.h:119
    > in_atomic():1, irqs_disabled():0
    > Call Trace:
    > [<c0122ddb>] __might_sleep+0xab/0xd0
    > [<d1bd2df6>] uart_unregister_port+0x76/0xa9 [serial_core]
    > [<d1bd9559>] unregister_serial+0x19/0x20 [8250]
    > [<d1bcb2de>] acpi_serial_remove+0x2e/0x50 [8250_acpi]
    > [<c02523f0>] acpi_driver_detach+0xcc/0x184
    > [<c0252621>] acpi_bus_unregister_driver+0x18/0x168
    > [<d1bcb312>] acpi_serial_exit+0x12/0x14 [8250_acpi]
    > [<c014510f>] sys_delete_module+0x13f/0x160
    > [<c0166307>] sys_munmap+0x57/0x80
    > [<c010a14f>] syscall_call+0x7/0xb

    acpi_driver_detach is calling the acpi_driver.remove() method under
    the acpi_device_lock spinlock.

    uart_unregister_port() happens to be using a semaphore for its locking.

    I do think that it would be better if ACPI were to permit this. From a
    quick peek it appears that acpi_device_lock can simply become a semaphore?

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