https://bugzilla.kernel.org/show_bug.cgi?id=18012
Summary: PM1a registers in MMIO space causes panic
Product: ACPI
Version: 2.5
Kernel Version: 2.6.36-rc3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Other
AssignedTo: acpi_config-ot...@kernel-bugs.osdl.org
ReportedBy: bjorn.helg...@hp.com
Regression: No
The acpi_irq() path reads the PM1a registers. These registers are in
I/O port space on most machines, and there's no problem in that case.
But these registers may be in MMIO space instead, and in that case,
we use acpi_os_read_memory(), which is not safe in interrupt context
because it depends on ioremap(), which may allocate memory.
Here's a stacktrace from such a machine (this is a prototype, and I
can't supply any details about it):
kernel BUG at .../mm/vmalloc.c:1226!
invalid opcode: 0000 [#1] SMP
Pid: 1, comm: swapper Tainted: G M 2.6.35-06116-g73f44ba-dirty #9
Call Trace:
[<ffffffff810cb575>] get_vm_area_caller+0x39/0x3b
[<ffffffff81026f76>] __ioremap_caller+0x250/0x2ee
[<ffffffff8102709d>] ioremap_nocache+0x12/0x14
[<ffffffff8121b003>] acpi_os_read_memory+0x17/0x61
[<ffffffff81237775>] acpi_hw_read+0x4c/0xc3
[<ffffffff81237816>] acpi_hw_read_multiple+0x2a/0x63
[<ffffffff81237a40>] acpi_hw_register_read+0x53/0xe3
[<ffffffff8122bda9>] acpi_ev_fixed_event_detect+0x31/0xfe
[<ffffffff8122cb1c>] acpi_ev_sci_xrupt_handler+0xf/0x22
[<ffffffff8121a30d>] acpi_irq+0x11/0x2c
[<ffffffff81086c87>] handle_IRQ_event+0x58/0x130
[<ffffffff81088900>] handle_fasteoi_irq+0x8c/0xc7
[<ffffffff81004f2e>] handle_irq+0x86/0x90
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