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ACPI / scan: not cache _SUN value in struct acpi_device_pnp

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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 202317a573 (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: 202317a573 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Yasuaki Ishimatsu <[email protected]>
Cc: 3.14+ <[email protected]> # 3.14+
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Yasuaki Ishimatsu 2014-09-03 13:39:13 +09:00 • committed by Rafael J. Wysocki
commit a383b68d9f
2 changed files with 8 additions and 8 deletions
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1
include/acpi/acpi_bus.h
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@ -246,7 +246,6 @@ struct acpi_device_pnp {
acpi_device_name device_name; /* Driver-determined */
acpi_device_class device_class; /* " */
union acpi_object *str_obj; /* unicode string for _STR method */
unsigned long sun; /* _SUN */
};
#define acpi_device_bid(d) ((d)->pnp.bus_id)