soc/tegra: fuse: Use resource-managed helpers

Use resource-managed helpers to make code cleaner and more correct,
properly releasing all resources in case of driver probe error.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Author: digetx

drivers/soc/tegra/fuse/fuse-tegra.c

@@ -182,20 +182,29 @@ static const struct nvmem_cell_info tegra_fuse_cells[] = {
 	},
 };
 
+static void tegra_fuse_restore(void *base)
+{
+	fuse->clk = NULL;
+	fuse->base = base;
+}
+
 static int tegra_fuse_probe(struct platform_device *pdev)
 {
 	void __iomem *base = fuse->base;
 	struct nvmem_config nvmem;
 	struct resource *res;
 	int err;
 
+	err = devm_add_action(&pdev->dev, tegra_fuse_restore, base);
+	if (err)
+		return err;
+
 	/* take over the memory region from the early initialization */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	fuse->phys = res->start;
 	fuse->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(fuse->base)) {
 		err = PTR_ERR(fuse->base);
-		fuse->base = base;
 		return err;
 	}
 
@@ -205,19 +214,20 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
 				PTR_ERR(fuse->clk));
 
-		fuse->base = base;
 		return PTR_ERR(fuse->clk);
 	}
 
 	platform_set_drvdata(pdev, fuse);
 	fuse->dev = &pdev->dev;
 
-	pm_runtime_enable(&pdev->dev);
+	err = devm_pm_runtime_enable(&pdev->dev);
+	if (err)
+		return err;
 
 	if (fuse->soc->probe) {
 		err = fuse->soc->probe(fuse);
 		if (err < 0)
-			goto restore;
+			return err;
 	}
 
 	memset(&nvmem, 0, sizeof(nvmem));
@@ -241,15 +251,15 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 		err = PTR_ERR(fuse->nvmem);
 		dev_err(&pdev->dev, "failed to register NVMEM device: %d\n",
 			err);
-		goto restore;
+		return err;
 	}
 
 	fuse->rst = devm_reset_control_get_optional(&pdev->dev, "fuse");
 	if (IS_ERR(fuse->rst)) {
 		err = PTR_ERR(fuse->rst);
 		dev_err(&pdev->dev, "failed to get FUSE reset: %pe\n",
 			fuse->rst);
-		goto restore;
+		return err;
 	}
 
 	/*
@@ -258,26 +268,20 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 	 */
 	err = pm_runtime_resume_and_get(&pdev->dev);
 	if (err)
-		goto restore;
+		return err;
 
 	err = reset_control_reset(fuse->rst);
 	pm_runtime_put(&pdev->dev);
 
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to reset FUSE: %d\n", err);
-		goto restore;
+		return err;
 	}
 
 	/* release the early I/O memory mapping */
 	iounmap(base);
 
 	return 0;
-
-restore:
-	fuse->clk = NULL;
-	fuse->base = base;
-	pm_runtime_disable(&pdev->dev);
-	return err;
 }
 
 static int __maybe_unused tegra_fuse_runtime_resume(struct device *dev)

drivers/soc/tegra/fuse/fuse-tegra20.c

@@ -94,9 +94,28 @@ static bool dma_filter(struct dma_chan *chan, void *filter_param)
 	return of_device_is_compatible(np, "nvidia,tegra20-apbdma");
 }
 
+static void tegra20_fuse_release_channel(void *data)
+{
+	struct tegra_fuse *fuse = data;
+
+	dma_release_channel(fuse->apbdma.chan);
+	fuse->apbdma.chan = NULL;
+}
+
+static void tegra20_fuse_free_coherent(void *data)
+{
+	struct tegra_fuse *fuse = data;
+
+	dma_free_coherent(fuse->dev, sizeof(u32), fuse->apbdma.virt,
+			  fuse->apbdma.phys);
+	fuse->apbdma.virt = NULL;
+	fuse->apbdma.phys = 0x0;
+}
+
 static int tegra20_fuse_probe(struct tegra_fuse *fuse)
 {
 	dma_cap_mask_t mask;
+	int err;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
@@ -105,13 +124,21 @@ static int tegra20_fuse_probe(struct tegra_fuse *fuse)
 	if (!fuse->apbdma.chan)
 		return -EPROBE_DEFER;
 
+	err = devm_add_action_or_reset(fuse->dev, tegra20_fuse_release_channel,
+				       fuse);
+	if (err)
+		return err;
+
 	fuse->apbdma.virt = dma_alloc_coherent(fuse->dev, sizeof(u32),
 					       &fuse->apbdma.phys,
 					       GFP_KERNEL);
-	if (!fuse->apbdma.virt) {
-		dma_release_channel(fuse->apbdma.chan);
+	if (!fuse->apbdma.virt)
 		return -ENOMEM;
-	}
+
+	err = devm_add_action_or_reset(fuse->dev, tegra20_fuse_free_coherent,
+				       fuse);
+	if (err)
+		return err;
 
 	fuse->apbdma.config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	fuse->apbdma.config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;