linux-kernel - [PATCH -next v2 2/3] devtmpfs: add debug info to handle()

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Message-ID: <20230210095444.4067307-3-xialonglong1@huawei.com>
Date:   Fri, 10 Feb 2023 09:54:43 +0000
From:   Longlong Xia <xialonglong1@...wei.com>
To:     <gregkh@...uxfoundation.org>
CC:     <chenwandun@...wei.com>, <linux-kernel@...r.kernel.org>,
        <rafael@...nel.org>, <sunnanyong@...wei.com>,
        <wangkefeng.wang@...wei.com>, <xialonglong1@...wei.com>
Subject: [PATCH -next v2 2/3] devtmpfs: add debug info to handle()

Because handle() is the core function for processing devtmpfs requests,
Let's add some debug info in handle() to help users know why failed.

Signed-off-by: Longlong Xia <xialonglong1@...wei.com>
---
 drivers/base/devtmpfs.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index ae72d4ba8547..7789b7be4ee5 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -389,10 +389,18 @@ static __initdata DECLARE_COMPLETION(setup_done);
 static int handle(const char *name, umode_t mode, kuid_t uid, kgid_t gid,
 		  struct device *dev)
 {
+	int ret;
+
 	if (mode)
-		return handle_create(name, mode, uid, gid, dev);
+		ret = handle_create(name, mode, uid, gid, dev);
 	else
-		return handle_remove(name, dev);
+		ret = handle_remove(name, dev);
+
+	if (ret)
+		dev_err(dev, "failed to %s %s, ret = %d\n",
+			mode ? "create" : "remove", name, ret);
+
+	return ret;
 }
 
 static void __noreturn devtmpfs_work_loop(void)
-- 
2.25.1