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>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
index 6d32e09327f1..675aaa91a770 100644
--- a/drivers/acpi/acpica/exsystem.c
+++ b/drivers/acpi/acpica/exsystem.c
@@ -201,6 +201,14 @@ acpi_status acpi_ex_system_do_sleep(u64 how_long)
 
         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);
 
         /* And now we must get the interpreter again */