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dmaengine: protect 'id' from concurrent registrations

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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>
This commit is contained in:
Dan Williams 2008-12-03 17:17:07 -07:00
parent 532d3b1f86
commit b0b42b16ff
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/dmaengine.c
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@ -388,7 +388,10 @@ int dma_async_device_register(struct dma_device *device)
init_completion(&device->done); init_completion(&device->done);
kref_init(&device->refcount); kref_init(&device->refcount);
mutex_lock(&dma_list_mutex);
device->dev_id = id++; device->dev_id = id++;
mutex_unlock(&dma_list_mutex);
/* represent channels in sysfs. Probably want devs too */ /* represent channels in sysfs. Probably want devs too */
list_for_each_entry(chan, &device->channels, device_node) { list_for_each_entry(chan, &device->channels, device_node) {