misc: rp1-pio: Fix a config_xfer error path

If the DMA channel allocation fails, the relevant dma_configs entry
should be marked as no longer claimed, otherwise rp1_pio_sm_dma_free
will be called with an error number as a DMA channel pointer.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

drivers/misc/rp1-pio.c

@@ -648,8 +648,10 @@ static int rp1_pio_sm_config_xfer_internal(struct rp1_pio_client *client, uint s
 	chan_name[3] = '\0';
 
 	dma->chan = dma_request_chan(dev, chan_name);
-	if (IS_ERR(dma->chan))
-		return PTR_ERR(dma->chan);
+	if (IS_ERR(dma->chan)) {
+		ret = PTR_ERR(dma->chan);
+		goto err_unclaim;
+	}
 
 	/* Alloc and map bounce buffers */
 	for (dma->buf_count = 0; dma->buf_count < buf_count; dma->buf_count++) {
@@ -694,6 +696,7 @@ static int rp1_pio_sm_config_xfer_internal(struct rp1_pio_client *client, uint s
 err_dma_free:
 	rp1_pio_sm_dma_free(dev, dma);
 
+err_unclaim:
 	spin_lock(&pio->lock);
 	client->claimed_dmas &= ~dma_mask;
 	pio->claimed_dmas &= ~dma_mask;