From: Li RongQing <lirongqing@baidu.com>
Commit b44a06bd28f2 ("vfio/pci: Remove #ifdef iowrite64 and #ifdef
ioread64") inadvertently converted a conditional 8-byte rejection
into an unconditional one.
Originally, 'count == 8' was rejected only if iowrite64 was undefined
(#ifndef iowrite64). When iowrite64 became globally available via generic
fallbacks, this rejection became dead code, allowing 8-byte ioeventfds.
However, b44a06bd28f2 removed the #ifndef wrappers but left the nested
'if (count == 8) return -EINVAL;' intact, breaking all 8-byte
registrations.
Drop the unconditional check to restore 8-byte ioeventfd support,
matching the original intent.
Fixes: b44a06bd28f2 ("vfio/pci: Remove #ifdef iowrite64 and #ifdef ioread64")
Cc: stable@vger.kernel.org
Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
drivers/vfio/pci/vfio_pci_rdwr.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
index 7f14dd4..df88480 100644
--- a/drivers/vfio/pci/vfio_pci_rdwr.c
+++ b/drivers/vfio/pci/vfio_pci_rdwr.c
@@ -423,9 +423,6 @@ int vfio_pci_ioeventfd(struct vfio_pci_core_device *vdev, loff_t offset,
pos >= vdev->msix_offset + vdev->msix_size))
return -EINVAL;
- if (count == 8)
- return -EINVAL;
-
io = vfio_pci_core_get_iomap(vdev, bar);
if (IS_ERR(io))
return PTR_ERR(io);
--
2.9.4