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| author | Holger Macht <hmacht@suse.de> | 2009-01-20 14:18:24 +0300 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-02-07 06:08:15 +0300 |
| commit | fc5a9f8841ee87d93376ada5d73117d4d6a373ea (patch) | |
| tree | ca1098636b4918c00a49faf34c4e0d6e99852296 /drivers/acpi/dock.c | |
| parent | 9e3a9d1ed8cc8db93e5c53e9a5b09065bd95de8b (diff) | |
| download | linux-fc5a9f8841ee87d93376ada5d73117d4d6a373ea.tar.xz | |
ACPI: dock: Don't eval _STA on every show_docked sysfs read
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>
Diffstat (limited to 'drivers/acpi/dock.c')
| -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 5b30b8d91d71..afd5db3c7562 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); |