ACPICA: Limit maximum time for Sleep() operator
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>
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@ -119,6 +119,10 @@
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#define ACPI_MAX_LOOP_ITERATIONS 0xFFFF
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/* Maximum sleep allowed via Sleep() operator */
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#define ACPI_MAX_SLEEP 20000 /* Two seconds */
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/******************************************************************************
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*
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* ACPI Specification constants (Do not change unless the specification changes)
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@ -201,6 +201,14 @@ acpi_status acpi_ex_system_do_sleep(u64 how_long)
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acpi_ex_relinquish_interpreter();
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/*
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* For compatibility with other ACPI implementations and to prevent
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* accidental deep sleeps, limit the sleep time to something reasonable.
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*/
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if (how_long > ACPI_MAX_SLEEP) {
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how_long = ACPI_MAX_SLEEP;
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}
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acpi_os_sleep(how_long);
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/* And now we must get the interpreter again */
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