[PATCH 2/6] dmaengine: virt-dma: Add missing locking around list operations

[Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>]

All list operations are protected by &vc->lock. As vchan_vdesc_fini()
is called unlocked add the missing locking around the list operations.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 drivers/dma/virt-dma.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h
index e213137b6bc1..e9f5250fbe4d 100644
--- a/drivers/dma/virt-dma.h
+++ b/drivers/dma/virt-dma.h
@@ -113,10 +113,15 @@ static inline void vchan_vdesc_fini(struct virt_dma_desc *vd)
 {
 	struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan);
 
-	if (dmaengine_desc_test_reuse(&vd->tx))
+	if (dmaengine_desc_test_reuse(&vd->tx)) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&vc->lock, flags);
 		list_add(&vd->node, &vc->desc_allocated);
-	else
+		spin_unlock_irqrestore(&vc->lock, flags);
+	} else {
 		vc->desc_free(vd);
+	}
 }
 
 /**
-- 
2.24.0