[PATCH 3/3] cxl/memdev: Don't mask an earlier partition's poison query error

cxl_get_poison_by_memdev() reassigns rc every partition iteration with
no early exit, so an error from an earlier partition (e.g. -EIO on
partition 0) is overwritten when a later partition succeeds, hiding the
failure from the trigger_poison_list sysfs write.

Break on the first failure, after the -EFAULT-on-RAM exception that
intentionally tolerates devices without volatile poison-list support.

Fixes: be5cbd084027 ("cxl: Kill enum cxl_decoder_mode")
Reported-by: [email protected]
Closes: https://sashiko.dev/#/patchset/[email protected]?part=5
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Dave Jiang <[email protected]>
---
 drivers/cxl/core/memdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 33a3d2e7b13a..8718964b9c5e 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -231,6 +231,8 @@ static int cxl_get_poison_by_memdev(struct cxl_memdev *cxlmd)
 		 */
 		if (rc == -EFAULT && cxlds->part[i].mode == CXL_PARTMODE_RAM)
 			rc = 0;
+		if (rc)
+			break;
 	}
 	return rc;
 }
-- 
2.55.0