[PATCH] soc/tegra: fuse: fix possible null-ptr-deref in tegra_fuse_probe()

[Yang Yingliang]

It will cause null-ptr-deref when using 'res', if platform_get_resource()
returns NULL, so move using 'res' after devm_ioremap_resource() that
will check it to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.

Fixes: 55a042b3f68f ("soc/tegra: fuse: Fix reading registers using DMA on Tegra20")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/soc/tegra/fuse/fuse-tegra.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/tegra/fuse/fuse-tegra.c b/drivers/soc/tegra/fuse/fuse-tegra.c
index aa94fda282f4..e85a78a80c48 100644
--- a/drivers/soc/tegra/fuse/fuse-tegra.c
+++ b/drivers/soc/tegra/fuse/fuse-tegra.c
@@ -218,13 +218,12 @@ static int tegra_fuse_probe(struct platform_device *pdev)
 		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);
+	fuse->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(fuse->base)) {
 		err = PTR_ERR(fuse->base);
 		return err;
 	}
+	fuse->phys = res->start;
 
 	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
 	if (IS_ERR(fuse->clk)) {
-- 
2.25.1