[PATCH V3 1/3] block: clear BLK_FEAT_PCI_P2PDMA in blk_stack_limits() for non-supporting devices

[Chaitanya Kulkarni]

BLK_FEAT_NOWAIT and BLK_FEAT_POLL are cleared in blk_stack_limits()
when an underlying device does not support them.  Apply the same
treatment to BLK_FEAT_PCI_P2PDMA: stacking drivers set it
unconditionally and rely on the core to clear it whenever a
non-supporting member device is stacked.

Signed-off-by: Chaitanya Kulkarni <kch at nvidia.com>
---
 block/blk-settings.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 78c83817b9d3..8274631290db 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -795,6 +795,8 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 		t->features &= ~BLK_FEAT_NOWAIT;
 	if (!(b->features & BLK_FEAT_POLL))
 		t->features &= ~BLK_FEAT_POLL;
+	if (!(b->features & BLK_FEAT_PCI_P2PDMA))
+		t->features &= ~BLK_FEAT_PCI_P2PDMA;
 
 	t->flags |= (b->flags & BLK_FLAG_MISALIGNED);
 
-- 
2.39.5