dmaengine: protect 'id' from concurrent registrations



There is a possibility to have two devices registered with the same id.

Cc: <stable@kernel.org>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

parent 532d3b1f

drivers/dma/dmaengine.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -388,7 +388,10 @@ int dma_async_device_register(struct dma_device *device)

		init_completion(&device->done);
		kref_init(&device->refcount);

		mutex_lock(&dma_list_mutex);
		device->dev_id = id++;
		mutex_unlock(&dma_list_mutex);

		/* represent channels in sysfs. Probably want devs too */
		list_for_each_entry(chan, &device->channels, device_node) {