[PATCHv2 1/4] memory: fsl_ifc: Fix optional NAND IRQ handling and migrate to platform IRQ API

[Rosen Penev]

Switch from irq_of_parse_and_map() to platform_get_irq() for the main
controller IRQ, and use platform_get_irq_optional() for the NAND IRQ
which is optional. Guard free_irq() calls on the NAND IRQ with a
nand_irq > 0 check to avoid passing invalid IRQ numbers on platforms
without a dedicated NAND interrupt line.

Get IRQs first as they can return a probe defferal error. Helps avoid
doing actual work in such a case.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/memory/fsl_ifc.c | 43 ++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/drivers/memory/fsl_ifc.c b/drivers/memory/fsl_ifc.c
index e89e0c6cc4bc..dce94d8b05b9 100644
--- a/drivers/memory/fsl_ifc.c
+++ b/drivers/memory/fsl_ifc.c
@@ -89,12 +89,10 @@ static void fsl_ifc_ctrl_remove(struct platform_device *dev)
 	struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(&dev->dev);
 
 	of_platform_depopulate(&dev->dev);
-	free_irq(ctrl->nand_irq, ctrl);
+	if (ctrl->nand_irq > 0)
+		free_irq(ctrl->nand_irq, ctrl);
 	free_irq(ctrl->irq, ctrl);
 
-	irq_dispose_mapping(ctrl->nand_irq);
-	irq_dispose_mapping(ctrl->irq);
-
 	iounmap(ctrl->gregs);
 
 	dev_set_drvdata(&dev->dev, NULL);
@@ -204,9 +202,21 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 	int ret = 0;
 	int version, banks;
 	void __iomem *addr;
+	int nand_irq;
+	int irq;
 
 	dev_info(&dev->dev, "Freescale Integrated Flash Controller\n");
 
+	/* get the Controller level irq */
+	irq = platform_get_irq(dev, 0);
+	if (irq < 0)
+		return irq;
+
+	/* get the nand machine irq */
+	nand_irq = platform_get_irq_optional(dev, 1);
+	if (nand_irq == -EPROBE_DEFER)
+		return nand_irq;
+
 	fsl_ifc_ctrl_dev = devm_kzalloc(&dev->dev, sizeof(*fsl_ifc_ctrl_dev),
 					GFP_KERNEL);
 	if (!fsl_ifc_ctrl_dev)
@@ -246,23 +256,13 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 		addr += PGOFFSET_4K;
 	fsl_ifc_ctrl_dev->rregs = addr;
 
-	/* get the Controller level irq */
-	fsl_ifc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0);
-	if (fsl_ifc_ctrl_dev->irq == 0) {
-		dev_err(&dev->dev, "failed to get irq resource for IFC\n");
-		ret = -ENODEV;
-		goto err;
-	}
-
-	/* get the nand machine irq */
-	fsl_ifc_ctrl_dev->nand_irq =
-			irq_of_parse_and_map(dev->dev.of_node, 1);
+	fsl_ifc_ctrl_dev->irq = irq;
 
 	fsl_ifc_ctrl_dev->dev = &dev->dev;
 
 	ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev);
 	if (ret < 0)
-		goto err_unmap_nandirq;
+		goto err;
 
 	init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);
 
@@ -271,10 +271,11 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 	if (ret != 0) {
 		dev_err(&dev->dev, "failed to install irq (%d)\n",
 			fsl_ifc_ctrl_dev->irq);
-		goto err_unmap_nandirq;
+		goto err;
 	}
 
-	if (fsl_ifc_ctrl_dev->nand_irq) {
+	fsl_ifc_ctrl_dev->nand_irq = nand_irq;
+	if (fsl_ifc_ctrl_dev->nand_irq > 0) {
 		ret = request_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_nand_irq,
 				0, "fsl-ifc-nand", fsl_ifc_ctrl_dev);
 		if (ret != 0) {
@@ -292,12 +293,10 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 	return 0;
 
 err_free_nandirq:
-	free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
+	if (fsl_ifc_ctrl_dev->nand_irq > 0)
+		free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
 err_free_irq:
 	free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev);
-err_unmap_nandirq:
-	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
-	irq_dispose_mapping(fsl_ifc_ctrl_dev->irq);
 err:
 	iounmap(fsl_ifc_ctrl_dev->gregs);
 	return ret;
-- 
2.55.0