[PATCH 6.9 109/281] cxl/region: Fix memregion leaks in devm_cxl_add_region()

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6.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Zhijian <lizhijian@xxxxxxxxxxx>

[ Upstream commit 49ba7b515c4c0719b866d16f068e62d16a8a3dd1 ]

Move the mode verification to __create_region() before allocating the
memregion to avoid the memregion leaks.

Fixes: 6e099264185d ("cxl/region: Add volatile region creation support")
Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240507053421.456439-1-lizhijian@xxxxxxxxxxx
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/cxl/core/region.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 812b2948b6c65..18b95149640b6 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2352,15 +2352,6 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd,
 	struct device *dev;
 	int rc;
 
-	switch (mode) {
-	case CXL_DECODER_RAM:
-	case CXL_DECODER_PMEM:
-		break;
-	default:
-		dev_err(&cxlrd->cxlsd.cxld.dev, "unsupported mode %d\n", mode);
-		return ERR_PTR(-EINVAL);
-	}
-
 	cxlr = cxl_region_alloc(cxlrd, id);
 	if (IS_ERR(cxlr))
 		return cxlr;
@@ -2415,6 +2406,15 @@ static struct cxl_region *__create_region(struct cxl_root_decoder *cxlrd,
 {
 	int rc;
 
+	switch (mode) {
+	case CXL_DECODER_RAM:
+	case CXL_DECODER_PMEM:
+		break;
+	default:
+		dev_err(&cxlrd->cxlsd.cxld.dev, "unsupported mode %d\n", mode);
+		return ERR_PTR(-EINVAL);
+	}
+
 	rc = memregion_alloc(GFP_KERNEL);
 	if (rc < 0)
 		return ERR_PTR(rc);
-- 
2.43.0







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