dmaengine: use idr for registering dma device numbers
This brings some predictability to dma device numbers, i.e. an rmmod/insmod
cycle may now result in /sys/class/dma/dma0chan0 being restored rather than
/sys/class/dma/dma1chan0 appearing.
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index d6b6bff..64dea2a 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -140,10 +140,14 @@
* struct dma_chan_dev - relate sysfs device node to backing channel device
* @chan - driver channel device
* @device - sysfs device
+ * @dev_id - parent dma_device dev_id
+ * @idr_ref - reference count to gate release of dma_device dev_id
*/
struct dma_chan_dev {
struct dma_chan *chan;
struct device device;
+ int dev_id;
+ atomic_t *idr_ref;
};
static inline const char *dma_chan_name(struct dma_chan *chan)