diff options
| author | Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> | 2014-09-03 13:39:13 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-17 09:19:20 -0700 |
| commit | 089d41d4057ff601e34b701a4d03f06c479900aa (patch) | |
| tree | 4742152b04fc5bfae6af79965b0aedda8c994a72 /drivers/acpi | |
| parent | 4b56ddf9debed7505e336202209a8a2dfda5852d (diff) | |
ACPI / scan: not cache _SUN value in struct acpi_device_pnp
commit a383b68d9fe9864c4d3b86f67ad6488f58136435 upstream.
The _SUN device indentification object is not guaranteed to return
the same value every time it is executed, so we should not cache its
return value, but rather execute it every time as needed. If it is
cached, an incorrect stale value may be used in some situations.
This issue was exposed by commit 202317a573b2 (ACPI / scan: Add
acpi_device objects for all device nodes in the namespace). Fix it
by avoiding to cache the return value of _SUN.
Fixes: 202317a573b2 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/scan.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 2772aaf88691..92d5184e3654 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -661,8 +661,14 @@ static ssize_t acpi_device_sun_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); + acpi_status status; + unsigned long long sun; + + status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); + if (ACPI_FAILURE(status)) + return -ENODEV; - return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); + return sprintf(buf, "%llu\n", sun); } static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); @@ -684,7 +690,6 @@ static int acpi_device_setup_files(struct acpi_device *dev) { struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; acpi_status status; - unsigned long long sun; int result = 0; /* @@ -725,14 +730,10 @@ static int acpi_device_setup_files(struct acpi_device *dev) if (dev->pnp.unique_id) result = device_create_file(&dev->dev, &dev_attr_uid); - status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); - if (ACPI_SUCCESS(status)) { - dev->pnp.sun = (unsigned long)sun; + if (acpi_has_method(dev->handle, "_SUN")) { result = device_create_file(&dev->dev, &dev_attr_sun); if (result) goto end; - } else { - dev->pnp.sun = (unsigned long)-1; } if (acpi_has_method(dev->handle, "_STA")) { |