diff options
| author | Holger Macht <hmacht@suse.de> | 2009-01-20 12:18:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-12 09:50:25 -0800 |
| commit | b444b2b8819f20b7abd92939c7418ccc375cf732 (patch) | |
| tree | 7613173718459ecedd23df03c4de6cfa819f6a74 /drivers | |
| parent | 232d80938847060e01e894e6404ce162d4924954 (diff) | |
ACPI: dock: Don't eval _STA on every show_docked sysfs read
commit fc5a9f8841ee87d93376ada5d73117d4d6a373ea upstream.
Some devices trigger a DEVICE_CHECK on every evalutation of _STA. This
can also be seen in commit 8b59560a3baf2e7c24e0fb92ea5d09eca92805db
(ACPI: dock: avoid check _STA method). If an undock is processed, the
dock driver sends a uevent and userspace might read the show_docked
property in sysfs. This causes an evaluation of _STA of the particular
device which causes the dock driver to immediately dock again.
In any case, evaluation of _STA (show_docked) does not necessarily mean
that we are docked, so check with the internal device structure.
http://bugzilla.kernel.org/show_bug.cgi?id=12360
Signed-off-by: Holger Macht <hmacht@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/dock.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 5b30b8d91d7..afd5db3c756 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -855,10 +855,14 @@ fdd_out: static ssize_t show_docked(struct device *dev, struct device_attribute *attr, char *buf) { + struct acpi_device *tmp; + struct dock_station *dock_station = *((struct dock_station **) dev->platform_data); - return snprintf(buf, PAGE_SIZE, "%d\n", dock_present(dock_station)); + if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) + return snprintf(buf, PAGE_SIZE, "1\n"); + return snprintf(buf, PAGE_SIZE, "0\n"); } static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |