linux-kernel - [PATCH -next] mm/hmm/test: fix error return code in hmm_dmirror

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Date:   Sat, 9 May 2020 03:02:34 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     <jglisse@...hat.com>, Ralph Campbell <rcampbell@...dia.com>
CC:     Wei Yongjun <weiyongjun1@...wei.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        Hulk Robot <hulkci@...wei.com>
Subject: [PATCH -next] mm/hmm/test: fix error return code in hmm_dmirror_init()

Fix to return negative error code -ENOMEM from the alloc_page() error
handling case instead of 0, as done elsewhere in this function.

Fixes: 5d5e54be8a1e ("mm/hmm/test: add selftest driver for HMM")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 lib/test_hmm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index 00bca6116f93..b4d9434e49e7 100644
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -1119,8 +1119,10 @@ static int __init hmm_dmirror_init(void)
 	 * make the code here simpler (i.e., we need a struct page for it).
 	 */
 	dmirror_zero_page = alloc_page(GFP_HIGHUSER | __GFP_ZERO);
-	if (!dmirror_zero_page)
+	if (!dmirror_zero_page) {
+		ret = -ENOMEM;
 		goto err_chrdev;
+	}
 
 	pr_info("HMM test module loaded. This is only for testing HMM.\n");
 	return 0;