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ACPICA: Limit maximum time for Sleep() operator

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To prevent accidental deep sleeps, limit the maximum time that
Sleep() will sleep. Configurable, default maximum is two seconds.
ACPICA bugzilla 854.

http://www.acpica.org/bugzilla/show_bug.cgi?id=854

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2010-05-26 11:22:41 +08:00 committed by Len Brown
parent d70326689b
commit 9cbfa18e8a
2 changed files with 12 additions and 0 deletions
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4
drivers/acpi/acpica/acconfig.h
View file

@ -119,6 +119,10 @@
#define ACPI_MAX_LOOP_ITERATIONS 0xFFFF #define ACPI_MAX_LOOP_ITERATIONS 0xFFFF
/* Maximum sleep allowed via Sleep() operator */
#define ACPI_MAX_SLEEP 20000 /* Two seconds */
/****************************************************************************** /******************************************************************************
* *
* ACPI Specification constants (Do not change unless the specification changes) * ACPI Specification constants (Do not change unless the specification changes)

8
drivers/acpi/acpica/exsystem.c
View file

@ -201,6 +201,14 @@ acpi_status acpi_ex_system_do_sleep(u64 how_long)
acpi_ex_relinquish_interpreter(); acpi_ex_relinquish_interpreter();
/*
* For compatibility with other ACPI implementations and to prevent
* accidental deep sleeps, limit the sleep time to something reasonable.
*/
if (how_long > ACPI_MAX_SLEEP) {
how_long = ACPI_MAX_SLEEP;
}
acpi_os_sleep(how_long); acpi_os_sleep(how_long);
/* And now we must get the interpreter again */ /* And now we must get the interpreter again */