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 09:30:59 -0800 |
| commit | 1d672ef324e78a467603ef55aa4558cac9f895ba (patch) | |
| tree | 06584c42f4704d1fe2c9bd11416f4b780e33283d /drivers/acpi | |
| parent | d60cceec0948426ee9b468f0ded136f56f506169 (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/acpi')
| -rw-r--r-- | drivers/acpi/dock.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index e28469ec2da7..eab790fbb69a 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -691,8 +691,14 @@ fdd_out: static ssize_t show_docked(struct device *dev, struct device_attribute *attr, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", dock_present(dock_station)); + struct acpi_device *tmp; + + struct dock_station *dock_station = *((struct dock_station **) + dev->platform_data); + 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); |