diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-16 02:38:30 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-20 01:56:30 +0400 |
| commit | 8112006f41fd76ddf4988f8ddd904563db85613c (patch) | |
| tree | cd47e67bbac7c000696be79971326f8bf4bd1706 | |
| parent | 204ebc0aa30a7115f300cac39fbb7eeb66524881 (diff) | |
| download | linux-8112006f41fd76ddf4988f8ddd904563db85613c.tar.xz | |
ACPI / dock: Take ACPI scan lock in write_undock()
Since commit 3757b94 (ACPI / hotplug: Fix concurrency issues and
memory leaks) acpi_bus_scan() and acpi_bus_trim() must always be
called under acpi_scan_lock, but currently the following scenario
violating that requirement is possible:
write_undock()
handle_eject_request()
hotplug_dock_devices()
dock_remove_acpi_device()
acpi_bus_trim()
Fix that by making write_undock() acquire acpi_scan_lock before
calling handle_eject_request() as appropriate (begin_undock() is
under the lock too in analogy with acpi_dock_deferred_cb()).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 3.9+ <stable@vger.kernel.org>
Acked-by: Toshi Kani <toshi.kani@hp.com>
| -rw-r--r-- | drivers/acpi/dock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c index 4fdea381ef21..ec117c6c996c 100644 --- a/drivers/acpi/dock.c +++ b/drivers/acpi/dock.c @@ -868,8 +868,10 @@ static ssize_t write_undock(struct device *dev, struct device_attribute *attr, if (!count) return -EINVAL; + acpi_scan_lock_acquire(); begin_undock(dock_station); ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); + acpi_scan_lock_release(); return ret ? ret: count; } static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |