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ACPICA: hw: Don't carry spinlock over suspend

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ACPI uses acpi_get_register() in order to get into suspend.
This function is guarded by acpi_gbl_hardware_lock, which will be carried
into resume phase.
At resume interrupts are enabled and first ACPI interrupt deadlocks on this
lock.
Solution seems to be to not lock register read, as there are no concurrent
activity at this point.

Reference: http://bugzilla.kernel.org/show_bug.cgi?id=7499

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Alexey Starikovskiy
2007-09-30 22:39:42 +04:00
committed by Len Brown
parent d30dc9abb4
commit 2d571b33cf
2 changed files with 4 additions and 1 deletions
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3
drivers/acpi/hardware/hwsleep.c
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@@ -398,7 +398,8 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
/* Wait until we enter sleep state */
do {
status = acpi_get_register(ACPI_BITREG_WAKE_STATUS, &in_value);
status = acpi_get_register_unlocked(ACPI_BITREG_WAKE_STATUS,
&in_value);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}