3.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
commit 8112006f41fd76ddf4988f8ddd904563db85613c upstream.
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@xxxxxxxxx>
Acked-by: Toshi Kani <toshi.kani@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/dock.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -868,8 +868,10 @@ static ssize_t write_undock(struct devic
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);
--
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