From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 3 Aug 2020 14:36:07 +0000 (+0300)
Subject: memory: jz4780_nemc: Fix an error pointer vs NULL check in probe()
X-Git-Tag: accepted/tizen/unified/20230118.172025~8242^2~4^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=96999c797ec1ef41259f00b4ddf9cf33b342cb78;p=platform%2Fkernel%2Flinux-rpi.git

memory: jz4780_nemc: Fix an error pointer vs NULL check in probe()

The devm_ioremap() function returns NULL on error, it doesn't return
error pointers.  This bug could lead to an Oops during probe.

Fixes: f046e4a3f0b9 ("memory: jz4780_nemc: Only request IO memory the driver will use")
Cc: <stable@vger.kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20200803143607.GC346925@mwanda
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---

diff --git a/drivers/memory/jz4780-nemc.c b/drivers/memory/jz4780-nemc.c
index 3ec5cb0..608ae92 100644
--- a/drivers/memory/jz4780-nemc.c
+++ b/drivers/memory/jz4780-nemc.c
@@ -304,9 +304,9 @@ static int jz4780_nemc_probe(struct platform_device *pdev)
 	}
 
 	nemc->base = devm_ioremap(dev, res->start, NEMC_REG_LEN);
-	if (IS_ERR(nemc->base)) {
+	if (!nemc->base) {
 		dev_err(dev, "failed to get I/O memory\n");
-		return PTR_ERR(nemc->base);
+		return -ENOMEM;
 	}
 
 	writel(0, nemc->base + NEMC_NFCSR);