From 221e8360834c59f0c9952630fa5904a94ebd2bb8 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Thu, 9 Sep 2021 17:06:08 +0800
Subject: n64cart: fix return value check in n64cart_probe()

From: Yang Yingliang <yangyingliang@huawei.com>

commit 221e8360834c59f0c9952630fa5904a94ebd2bb8 upstream.

In case of error, the function devm_platform_ioremap_resource()
returns ERR_PTR() and never returns NULL. The NULL test in the
return value check should be replaced with IS_ERR().

Fixes: d9b2a2bbbb4d ("block: Add n64 cart driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20210909090608.2989716-1-yangyingliang@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/block/n64cart.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/block/n64cart.c
+++ b/drivers/block/n64cart.c
@@ -129,8 +129,8 @@ static int __init n64cart_probe(struct p
 	}
 
 	reg_base = devm_platform_ioremap_resource(pdev, 0);
-	if (!reg_base)
-		return -EINVAL;
+	if (IS_ERR(reg_base))
+		return PTR_ERR(reg_base);
 
 	disk = blk_alloc_disk(NUMA_NO_NODE);
 	if (!disk)