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| author | Bob Moore <robert.moore@intel.com> | 2010-05-26 11:22:41 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2010-06-12 00:55:17 -0400 |
| commit | 9cbfa18e8a7b34a32eddbd914a07f085962f50a8 (patch) | |
| tree | 4ef8f4055af728372b94b1a9fb07b0eff09bea30 /drivers/acpi | |
| parent | d70326689b70b35527765bd3decbb1229459e928 (diff) | |
| download | blackbird-obmc-linux-9cbfa18e8a7b34a32eddbd914a07f085962f50a8.tar.gz blackbird-obmc-linux-9cbfa18e8a7b34a32eddbd914a07f085962f50a8.zip | |
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpica/acconfig.h | 4 | ||||
| -rw-r--r-- | drivers/acpi/acpica/exsystem.c | 8 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/acconfig.h b/drivers/acpi/acpica/acconfig.h index 33181ad350d5..b17d8de9f6ff 100644 --- a/drivers/acpi/acpica/acconfig.h +++ b/drivers/acpi/acpica/acconfig.h @@ -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) 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 */ |
