linux-kernel - [PATCH] ACPI: APEI: Remove redundant assignments in erst_dbg

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Message-ID: <20250903224913.242928-2-thorsten.blum@linux.dev>
Date: Thu,  4 Sep 2025 00:49:11 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	Hanjun Guo <guohanjun@...wei.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Shuai Xue <xueshuai@...ux.alibaba.com>,
	Len Brown <lenb@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ACPI: APEI: Remove redundant assignments in erst_dbg_{ioctl|write}()

Use the result of copy_from_user() directly instead of assigning it to
the local variable 'rc' and then overwriting it in erst_dbg_write() or
immediately returning from erst_dbg_ioctl().

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 drivers/acpi/apei/erst-dbg.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
index 246076341e8c..ff0e8bf8e97a 100644
--- a/drivers/acpi/apei/erst-dbg.c
+++ b/drivers/acpi/apei/erst-dbg.c
@@ -60,9 +60,8 @@ static long erst_dbg_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 
 	switch (cmd) {
 	case APEI_ERST_CLEAR_RECORD:
-		rc = copy_from_user(&record_id, (void __user *)arg,
-				    sizeof(record_id));
-		if (rc)
+		if (copy_from_user(&record_id, (void __user *)arg,
+				   sizeof(record_id)))
 			return -EFAULT;
 		return erst_clear(record_id);
 	case APEI_ERST_GET_RECORD_COUNT:
@@ -175,8 +174,7 @@ static ssize_t erst_dbg_write(struct file *filp, const char __user *ubuf,
 		erst_dbg_buf = p;
 		erst_dbg_buf_len = usize;
 	}
-	rc = copy_from_user(erst_dbg_buf, ubuf, usize);
-	if (rc) {
+	if (copy_from_user(erst_dbg_buf, ubuf, usize)) {
 		rc = -EFAULT;
 		goto out;
 	}
-- 
2.51.0