linux-kernel - [PATCH v3 6/7] cxl/region: Drop goto pattern in cxl_dax_region

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Message-Id: <20250221012453.126366-7-ming.li@zohomail.com>
Date: Fri, 21 Feb 2025 09:24:52 +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>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v3 6/7] cxl/region: Drop goto pattern in cxl_dax_region_alloc()

In cxl_dax_region_alloc(), there is a goto pattern to release the rwsem
cxl_region_rwsem when the function returns, the down_read() and up_read
can be replaced by a guard(rwsem_read) then the goto pattern can be
removed.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Alison Schofield <alison.schofield@...el.com>
Reviewed-by: Ira Weiny <ira.weiny@...el.com>
Acked-by: Davidlohr Bueso <dave@...olabs.net>
Signed-off-by: Li Ming <ming.li@...omail.com>
---
 drivers/cxl/core/region.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 8e68091e3f20..9f082bc0f4e3 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -3037,17 +3037,13 @@ static struct cxl_dax_region *cxl_dax_region_alloc(struct cxl_region *cxlr)
 	struct cxl_dax_region *cxlr_dax;
 	struct device *dev;
 
-	down_read(&cxl_region_rwsem);
-	if (p->state != CXL_CONFIG_COMMIT) {
-		cxlr_dax = ERR_PTR(-ENXIO);
-		goto out;
-	}
+	guard(rwsem_read)(&cxl_region_rwsem);
+	if (p->state != CXL_CONFIG_COMMIT)
+		return ERR_PTR(-ENXIO);
 
 	cxlr_dax = kzalloc(sizeof(*cxlr_dax), GFP_KERNEL);
-	if (!cxlr_dax) {
-		cxlr_dax = ERR_PTR(-ENOMEM);
-		goto out;
-	}
+	if (!cxlr_dax)
+		return ERR_PTR(-ENOMEM);
 
 	cxlr_dax->hpa_range.start = p->res->start;
 	cxlr_dax->hpa_range.end = p->res->end;
@@ -3060,8 +3056,6 @@ static struct cxl_dax_region *cxl_dax_region_alloc(struct cxl_region *cxlr)
 	dev->parent = &cxlr->dev;
 	dev->bus = &cxl_bus_type;
 	dev->type = &cxl_dax_region_type;
-out:
-	up_read(&cxl_region_rwsem);
 
 	return cxlr_dax;
 }
-- 
2.34.1