linux-kernel - [PATCH v1 3/7] cxl/memdev: cxl_memdev

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Message-Id: <20250211075727.351895-4-ming.li@zohomail.com>
Date: Tue, 11 Feb 2025 15:57:23 +0800
From: Li Ming <ming.li@...omail.com>
To: dave@...olabs.net,
	jonathan.cameron@...wei.com,
	dave.jiang@...el.com,
	alison.schofield@...el.com,
	vishal.l.verma@...el.com,
	ira.weiny@...el.com,
	dan.j.williams@...el.com
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Li Ming <ming.li@...omail.com>
Subject: [PATCH v1 3/7] cxl/memdev: cxl_memdev_ioctl() cleanup

In cxl_memdev_ioctl(), the down_read(&cxl_memdev_rwsem) and
up_read(&cxl_memdev_rwsem) can be replaced by a
guard(rwsem_read)(&cxl_memdev_rwsem), it helps to remove the open-coded
up_read(&cxl_memdev_rwsem). Besides, the local var 'rc' can be also
removed to make the code more cleaner.

Signed-off-by: Li Ming <ming.li@...omail.com>
---
 drivers/cxl/core/memdev.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 98c05426aa4a..6f90dcd626f9 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -668,15 +668,13 @@ static long cxl_memdev_ioctl(struct file *file, unsigned int cmd,
 {
 	struct cxl_memdev *cxlmd = file->private_data;
 	struct cxl_dev_state *cxlds;
-	int rc = -ENXIO;
 
-	down_read(&cxl_memdev_rwsem);
+	guard(rwsem_read)(&cxl_memdev_rwsem);
 	cxlds = cxlmd->cxlds;
 	if (cxlds && cxlds->type == CXL_DEVTYPE_CLASSMEM)
-		rc = __cxl_memdev_ioctl(cxlmd, cmd, arg);
-	up_read(&cxl_memdev_rwsem);
+		return __cxl_memdev_ioctl(cxlmd, cmd, arg);
 
-	return rc;
+	return -ENXIO;
 }
 
 static int cxl_memdev_open(struct inode *inode, struct file *file)
-- 
2.34.1