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Commit 9cbfa18e authored by Bob Moore's avatar Bob Moore Committed by Len Brown
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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: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent d7032668

drivers/acpi/acpica/acconfig.h

+4 −0
Original line number Diff line number Diff line
@@ -119,6 +119,10 @@ 


#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)

drivers/acpi/acpica/exsystem.c

+8 −0
Original line number Diff line number Diff line
@@ -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 */