[PATCHv4 10/15] dmaengine: fsldma: use devm_platform_ioremap_resource()

[Rosen Penev <rosenp@gmail.com>]

Convert of_iomap() to devm_platform_ioremap_resource() to let the devm
framework handle unmapping. This allows removing the out_iounmap
label and the explicit iounmap() in both the probe error path and
the remove function.

The DGSR (fdev->regs) and per-channel registers (chan->regs) map
physically distinct regions in all supported variants
(EloPlus/Elo/Elo3), so there is no overlap risk.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/dma/fsldma.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index c3d2b24f8f07..e4a3315a7d9d 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1238,17 +1238,15 @@ static int fsldma_of_probe(struct platform_device *op)
 	fdev->addr_bits = (long)device_get_match_data(fdev->dev);
 
 	/* ioremap the registers for use */
-	fdev->regs = of_iomap(op->dev.of_node, 0);
-	if (!fdev->regs)
-		return dev_err_probe(&op->dev, -ENOMEM, "unable to ioremap registers\n");
+	fdev->regs = devm_platform_ioremap_resource(op, 0);
+	if (IS_ERR(fdev->regs))
+		return PTR_ERR(fdev->regs);
 
 	/* map the channel IRQ if it exists, but don't hookup the handler yet */
 	fdev->irq = platform_get_irq_optional(op, 0);
 	if (fdev->irq < 0) {
-		if (fdev->irq != -ENXIO) {
-			err = fdev->irq;
-			goto out_iounmap;
-		}
+		if (fdev->irq != -ENXIO)
+			return fdev->irq;
 		fdev->irq = 0;
 	}
 
@@ -1319,8 +1317,6 @@ static int fsldma_of_probe(struct platform_device *op)
 		if (fdev->chan[i])
 			fsl_dma_chan_remove(fdev->chan[i]);
 	}
-out_iounmap:
-	iounmap(fdev->regs);
 	return err;
 }
 
@@ -1352,8 +1348,6 @@ static void fsldma_of_remove(struct platform_device *op)
 		if (chans[i])
 			fsl_dma_chan_remove(chans[i]);
 	}
-
-	iounmap(fdev->regs);
 }
 
 #ifdef CONFIG_PM
-- 
2.54.0