spi: microchip-core: fix and cleanups

Merge series from Yang Yingliang <yangyingliang@huawei.com>:

Patch #1 fix a UAF in mchp_corespi_remove().
Patch #2 and #3 some cleanups to simpify code.

drivers/spi/spi-microchip-core.c

@@ -513,7 +513,7 @@ static int mchp_corespi_probe(struct platform_device *pdev)
 	u32 num_cs;
 	int ret = 0;
 
-	master = spi_alloc_master(&pdev->dev, sizeof(*spi));
+	master = devm_spi_alloc_master(&pdev->dev, sizeof(*spi));
 	if (!master)
 		return dev_err_probe(&pdev->dev, -ENOMEM,
 				     "unable to allocate master for SPI controller\n");
@@ -535,58 +535,44 @@ static int mchp_corespi_probe(struct platform_device *pdev)
 	spi = spi_master_get_devdata(master);
 
 	spi->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-	if (IS_ERR(spi->regs)) {
-		ret = PTR_ERR(spi->regs);
-		goto error_release_master;
-	}
+	if (IS_ERR(spi->regs))
+		return PTR_ERR(spi->regs);
 
 	spi->irq = platform_get_irq(pdev, 0);
-	if (spi->irq <= 0) {
-		dev_err(&pdev->dev, "invalid IRQ %d for SPI controller\n", spi->irq);
-		ret = -ENXIO;
-		goto error_release_master;
-	}
+	if (spi->irq <= 0)
+		return dev_err_probe(&pdev->dev, -ENXIO,
+				     "invalid IRQ %d for SPI controller\n",
+				     spi->irq);
 
 	ret = devm_request_irq(&pdev->dev, spi->irq, mchp_corespi_interrupt,
 			       IRQF_SHARED, dev_name(&pdev->dev), master);
-	if (ret) {
-		dev_err(&pdev->dev, "could not request irq: %d\n", ret);
-		goto error_release_master;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "could not request irq: %d\n", ret);
 
 	spi->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(spi->clk)) {
-		ret = PTR_ERR(spi->clk);
-		dev_err(&pdev->dev, "could not get clk: %d\n", ret);
-		goto error_release_master;
-	}
+	if (IS_ERR(spi->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(spi->clk),
+				     "could not get clk: %d\n", ret);
 
 	ret = clk_prepare_enable(spi->clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to enable clock\n");
-		goto error_release_master;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to enable clock\n");
 
 	mchp_corespi_init(master, spi);
 
 	ret = devm_spi_register_master(&pdev->dev, master);
 	if (ret) {
-		dev_err(&pdev->dev,
-			"unable to register master for SPI controller\n");
-		goto error_release_hardware;
+		mchp_corespi_disable(spi);
+		clk_disable_unprepare(spi->clk);
+		return dev_err_probe(&pdev->dev, ret,
+				     "unable to register master for SPI controller\n");
 	}
 
 	dev_info(&pdev->dev, "Registered SPI controller %d\n", master->bus_num);
 
 	return 0;
-
-error_release_hardware:
-	mchp_corespi_disable(spi);
-	clk_disable_unprepare(spi->clk);
-error_release_master:
-	spi_master_put(master);
-
-	return ret;
 }
 
 static int mchp_corespi_remove(struct platform_device *pdev)
@@ -595,8 +581,6 @@ static int mchp_corespi_remove(struct platform_device *pdev)
 	struct mchp_corespi *spi = spi_master_get_devdata(master);
 
 	mchp_corespi_disable_ints(spi);
-	spi_unregister_master(master);
-	spi_master_put(master);
 	clk_disable_unprepare(spi->clk);
 	mchp_corespi_disable(spi);