From: Christoph Hellwig hch@lst.de
[ Upstream commit 72d447113bb751ded97b2e2c38f886e4a4139082 ]
For private namespaces ns->head_disk is NULL, so add a NULL check before updating the BDI capabilities.
Fixes: b2ce4d90690b ("nvme-multipath: set bdi capabilities once") Reported-by: Avinash M N Avinash.M.N@wdc.com Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Sagi Grimberg sagi@grimberg.me Reviewed-by: Max Gurtovoy maxg@mellanox.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/multipath.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 03bc3aba09871..36db7d2e6a896 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -673,10 +673,11 @@ void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id) }
if (bdi_cap_stable_pages_required(ns->queue->backing_dev_info)) { - struct backing_dev_info *info = - ns->head->disk->queue->backing_dev_info; + struct gendisk *disk = ns->head->disk;
- info->capabilities |= BDI_CAP_STABLE_WRITES; + if (disk) + disk->queue->backing_dev_info->capabilities |= + BDI_CAP_STABLE_WRITES; } }