1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index b3323c0697f6..ca6d572c48fc 100644
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -243,7 +243,15 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
         }
 
         if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {
-                if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)) {
+                /*
+                 * FIXME: nsio_rw_bytes() may be called from atomic
+                 * context in the btt case and nvdimm_clear_poison()
+                 * takes a sleeping lock. Until the locking can be
+                 * reworked this capability requires that the namespace
+                 * is not claimed by btt.
+                 */
+                if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
+                                && (!ndns->claim || !is_nd_btt(ndns->claim))) {
                         long cleared;
 
                         cleared = nvdimm_clear_poison(&ndns->dev, offset, size);