Expand the arsenal of devm functions for DMA
devices, this time for requesting channels.
Signed-off-by: Bence Csókás <csokas.bence@xxxxxxxxx>
---
drivers/dma/dmaengine.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index c1357d7f3dc6..51c41664838d 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -926,6 +926,36 @@ void dma_release_channel(struct dma_chan *chan)
}
EXPORT_SYMBOL_GPL(dma_release_channel);
+static void dmaenginem_release_channel(void *chan)
+{
+ dma_release_channel(chan);
+}
+
+/**
+ * devm_dma_request_chan - try to allocate an exclusive slave channel
+ * @dev: pointer to client device structure
+ * @name: slave channel name
+ *
+ * Returns pointer to appropriate DMA channel on success or an error pointer.
+ *
+ * The operation is managed and will be undone on driver detach.
+ */
+
+struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name)
+{
+ struct dma_chan *chan = dma_request_chan(dev, name);
+ int ret = 0;
+
+ if (!IS_ERR(chan))
+ ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan);
+
+ if (ret)
+ return PTR_ERR(ret);
+
+ return chan;
+}
+EXPORT_SYMBOL_GPL(devm_dma_request_chan);
+
/**
* dmaengine_get - register interest in dma_channels
*/
--
2.34.1
