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path: root/drivers/dma/idxd/device.c
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Diffstat (limited to 'drivers/dma/idxd/device.c')
-rw-r--r--drivers/dma/idxd/device.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index f6f49f0f6fae..8d79a8787104 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -62,6 +62,13 @@ int idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id)
perm.ignore = 0;
iowrite32(perm.bits, idxd->reg_base + offset);
+ /*
+ * A readback from the device ensures that any previously generated
+ * completion record writes are visible to software based on PCI
+ * ordering rules.
+ */
+ perm.bits = ioread32(idxd->reg_base + offset);
+
return 0;
}