m68k: virt: Fix missing platform_device_unregister() on error in virt_platform_init()

Add the missing platform_device_unregister() before return
from virt_platform_init() in the error handling case.

Fixes: 05d51e4 ("m68k: Introduce a virtual m68k machine")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Link: https://lore.kernel.org/r/20220628084903.3147123-1-yangyingliang@huawei.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Author: Yang Yingliang

arch/m68k/virt/platform.c

@@ -8,20 +8,15 @@
 
 #define VIRTIO_BUS_NB	128
 
-static int __init virt_virtio_init(unsigned int id)
+static struct platform_device * __init virt_virtio_init(unsigned int id)
 {
 	const struct resource res[] = {
 		DEFINE_RES_MEM(virt_bi_data.virtio.mmio + id * 0x200, 0x200),
 		DEFINE_RES_IRQ(virt_bi_data.virtio.irq + id),
 	};
-	struct platform_device *pdev;
 
-	pdev = platform_device_register_simple("virtio-mmio", id,
+	return platform_device_register_simple("virtio-mmio", id,
 					       res, ARRAY_SIZE(res));
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
-
-	return 0;
 }
 
 static int __init virt_platform_init(void)
@@ -35,38 +30,51 @@ static int __init virt_platform_init(void)
 		DEFINE_RES_MEM(virt_bi_data.rtc.mmio + 0x1000, 0x1000),
 		DEFINE_RES_IRQ(virt_bi_data.rtc.irq + 1),
 	};
-	struct platform_device *pdev;
+	struct platform_device *pdev1, *pdev2;
+	struct platform_device *pdevs[VIRTIO_BUS_NB];
 	unsigned int i;
+	int ret = 0;
 
 	if (!MACH_IS_VIRT)
 		return -ENODEV;
 
 	/* We need this to have DMA'able memory provided to goldfish-tty */
 	min_low_pfn = 0;
 
-	pdev = platform_device_register_simple("goldfish_tty",
-					       PLATFORM_DEVID_NONE,
-					       goldfish_tty_res,
-					       ARRAY_SIZE(goldfish_tty_res));
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
+	pdev1 = platform_device_register_simple("goldfish_tty",
+						PLATFORM_DEVID_NONE,
+						goldfish_tty_res,
+						ARRAY_SIZE(goldfish_tty_res));
+	if (IS_ERR(pdev1))
+		return PTR_ERR(pdev1);
 
-	pdev = platform_device_register_simple("goldfish_rtc",
-					       PLATFORM_DEVID_NONE,
-					       goldfish_rtc_res,
-					       ARRAY_SIZE(goldfish_rtc_res));
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
+	pdev2 = platform_device_register_simple("goldfish_rtc",
+						PLATFORM_DEVID_NONE,
+						goldfish_rtc_res,
+						ARRAY_SIZE(goldfish_rtc_res));
+	if (IS_ERR(pdev2)) {
+		ret = PTR_ERR(pdev2);
+		goto err_unregister_tty;
+	}
 
 	for (i = 0; i < VIRTIO_BUS_NB; i++) {
-		int err;
-
-		err = virt_virtio_init(i);
-		if (err)
-			return err;
+		pdevs[i] = virt_virtio_init(i);
+		if (IS_ERR(pdevs[i])) {
+			ret = PTR_ERR(pdevs[i]);
+			goto err_unregister_rtc_virtio;
+		}
 	}
 
 	return 0;
+
+err_unregister_rtc_virtio:
+	while (i > 0)
+		platform_device_unregister(pdevs[--i]);
+	platform_device_unregister(pdev2);
+err_unregister_tty:
+	platform_device_unregister(pdev1);
+
+	return ret;
 }
 
 arch_initcall(virt_platform_init);