ARM: edma: Convert to devm_* api

Use devm_ioremap_resource instead of reques_mem_region()/ioremap(),
devm_request_irq() instead of request_irq() and kzalloc() calls to
devm_kzalloc().

This ensures more consistent error values and simplifies error paths.
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
[nsekhar@ti.com: add missing err.h include]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/common/edma.c

@@ -17,6 +17,7 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -1382,7 +1383,6 @@ static int __init edma_probe(struct platform_device *pdev)
 	int			irq[EDMA_MAX_CC] = {0, 0};
 	int			err_irq[EDMA_MAX_CC] = {0, 0};
 	struct resource		*r[EDMA_MAX_CC] = {NULL};
-	resource_size_t		len[EDMA_MAX_CC];
 	char			res_name[10];
 	char			irq_name[10];
 
@@ -1402,26 +1402,14 @@ static int __init edma_probe(struct platform_device *pdev)
 			found = 1;
 		}
 
-		len[j] = resource_size(r[j]);
+		edmacc_regs_base[j] = devm_ioremap_resource(&pdev->dev, r[j]);
+		if (IS_ERR(edmacc_regs_base[j]))
+			return PTR_ERR(edmacc_regs_base[j]);
 
-		r[j] = request_mem_region(r[j]->start, len[j],
-			dev_name(&pdev->dev));
-		if (!r[j]) {
-			status = -EBUSY;
-			goto fail1;
-		}
-
-		edmacc_regs_base[j] = ioremap(r[j]->start, len[j]);
-		if (!edmacc_regs_base[j]) {
-			status = -EBUSY;
-			goto fail1;
-		}
-
-		edma_cc[j] = kzalloc(sizeof(struct edma), GFP_KERNEL);
-		if (!edma_cc[j]) {
-			status = -ENOMEM;
-			goto fail1;
-		}
+		edma_cc[j] = devm_kzalloc(&pdev->dev, sizeof(struct edma),
+					  GFP_KERNEL);
+		if (!edma_cc[j])
+			return -ENOMEM;
 
 		edma_cc[j]->num_channels = min_t(unsigned, info[j]->n_channel,
 							EDMA_MAX_DMACH);
@@ -1471,23 +1459,27 @@ static int __init edma_probe(struct platform_device *pdev)
 		sprintf(irq_name, "edma%d", j);
 		irq[j] = platform_get_irq_byname(pdev, irq_name);
 		edma_cc[j]->irq_res_start = irq[j];
-		status = request_irq(irq[j], dma_irq_handler, 0, "edma",
+		status = devm_request_irq(&pdev->dev, irq[j],
+					  dma_irq_handler, 0, "edma",
 					  &pdev->dev);
 		if (status < 0) {
-			dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
+			dev_dbg(&pdev->dev,
+				"devm_request_irq %d failed --> %d\n",
 				irq[j], status);
-			goto fail;
+			return status;
 		}
 
 		sprintf(irq_name, "edma%d_err", j);
 		err_irq[j] = platform_get_irq_byname(pdev, irq_name);
 		edma_cc[j]->irq_res_end = err_irq[j];
-		status = request_irq(err_irq[j], dma_ccerr_handler, 0,
+		status = devm_request_irq(&pdev->dev, err_irq[j],
+					  dma_ccerr_handler, 0,
 					  "edma_error", &pdev->dev);
 		if (status < 0) {
-			dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
+			dev_dbg(&pdev->dev,
+				"devm_request_irq %d failed --> %d\n",
 				err_irq[j], status);
-			goto fail;
+			return status;
 		}
 
 		for (i = 0; i < edma_cc[j]->num_channels; i++)
@@ -1522,23 +1514,6 @@ static int __init edma_probe(struct platform_device *pdev)
 	}
 
 	return 0;
-
-fail:
-	for (i = 0; i < EDMA_MAX_CC; i++) {
-		if (err_irq[i])
-			free_irq(err_irq[i], &pdev->dev);
-		if (irq[i])
-			free_irq(irq[i], &pdev->dev);
-	}
-fail1:
-	for (i = 0; i < EDMA_MAX_CC; i++) {
-		if (r[i])
-			release_mem_region(r[i]->start, len[i]);
-		if (edmacc_regs_base[i])
-			iounmap(edmacc_regs_base[i]);
-		kfree(edma_cc[i]);
-	}
-	return status;
 }