spi: spi-fsl-lpspi: remove redundant spi_controller_put call

[ Upstream commit bff892a ]

devm_spi_alloc_controller will allocate an SPI controller and
automatically release a reference on it when dev is unbound from
its driver. It doesn't need to call spi_controller_put explicitly
to put the reference when lpspi driver failed initialization.

Fixes: 2ae0ab0 ("spi: lpspi: Avoid potential use-after-free in probe()")
Signed-off-by: Carlos Song <[email protected]>
Reviewed-by: Alexander Sverdlin <[email protected]>
Link: https://msgid.link/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: NXP-CarlosSong

drivers/spi/spi-fsl-lpspi.c

@@ -881,39 +881,39 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	fsl_lpspi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(fsl_lpspi->base)) {
 		ret = PTR_ERR(fsl_lpspi->base);
-		goto out_controller_put;
+		return ret;
 	}
 	fsl_lpspi->base_phys = res->start;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		ret = irq;
-		goto out_controller_put;
+		return ret;
 	}
 
 	ret = devm_request_irq(&pdev->dev, irq, fsl_lpspi_isr, 0,
 			       dev_name(&pdev->dev), fsl_lpspi);
 	if (ret) {
 		dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
-		goto out_controller_put;
+		return ret;
 	}
 
 	fsl_lpspi->clk_per = devm_clk_get(&pdev->dev, "per");
 	if (IS_ERR(fsl_lpspi->clk_per)) {
 		ret = PTR_ERR(fsl_lpspi->clk_per);
-		goto out_controller_put;
+		return ret;
 	}
 
 	fsl_lpspi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
 	if (IS_ERR(fsl_lpspi->clk_ipg)) {
 		ret = PTR_ERR(fsl_lpspi->clk_ipg);
-		goto out_controller_put;
+		return ret;
 	}
 
 	/* enable the clock */
 	ret = fsl_lpspi_init_rpm(fsl_lpspi);
 	if (ret)
-		goto out_controller_put;
+		return ret;
 
 	ret = pm_runtime_get_sync(fsl_lpspi->dev);
 	if (ret < 0) {
@@ -974,8 +974,6 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	pm_runtime_dont_use_autosuspend(fsl_lpspi->dev);
 	pm_runtime_put_sync(fsl_lpspi->dev);
 	pm_runtime_disable(fsl_lpspi->dev);
-out_controller_put:
-	spi_controller_put(controller);
 
 	return ret;
 }