[PATCH 3/3] cxl/region: Don't leak tolerated RAM -EFAULT from unmapped poison scan

[Richard Cheng]

cxl_get_poison_unmapped() tolerates the -EFAULT a RAM partition returns
for Get Poison List by skipping that partition, but left rc holding the
error. If the tolerated RAM fault was the last poison query before the
loop ended, the function returned a spurious -EFAULT and the poison-list
read failed even though enumeration succeeded. Reset rc to 0 when
tolerating the fault, matching poison_by_decoder().

Fixes: be5cbd0840275 ("cxl: Kill enum cxl_decoder_mode")
Signed-off-by: Richard Cheng <icheng@xxxxxxxxxx>
---
 drivers/cxl/core/region.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index be246fb09c99..52ba8e9e4288 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2933,8 +2933,10 @@ static int cxl_get_poison_unmapped(struct cxl_memdev *cxlmd,
 		if (!length)
 			continue;
 		rc = cxl_mem_get_poison(cxlmd, offset, length, NULL);
-		if (rc == -EFAULT && cxlds->part[i].mode == CXL_PARTMODE_RAM)
+		if (rc == -EFAULT && cxlds->part[i].mode == CXL_PARTMODE_RAM) {
+			rc = 0;
 			continue;
+		}
 		if (rc)
 			break;
 	}
-- 
2.43.0