linux-kernel - [PATCH] hmm: Warn on devres

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Message-Id: <20181226180904.8193-1-pakki001@umn.edu>
Date:   Wed, 26 Dec 2018 12:09:04 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu,
        Jérôme Glisse <jglisse@...hat.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hmm: Warn on devres_release failure

devres_release can return -ENOENT if the device is not freed. The fix
throws a warning consistent with other invocations.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 mm/hmm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 90c34f3d1243..b06e3f092fbf 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1183,8 +1183,12 @@ static int hmm_devmem_match(struct device *dev, void *data, void *match_data)
 
 static void hmm_devmem_pages_remove(struct hmm_devmem *devmem)
 {
-	devres_release(devmem->device, &hmm_devmem_release,
-		       &hmm_devmem_match, devmem->resource);
+	int rc;
+
+	rc = devres_release(devmem->device, &hmm_devmem_release,
+				&hmm_devmem_match, devmem->resource);
+	if (rc)
+		WARN_ON(rc);
 }
 
 /*
-- 
2.17.1