[PATCH] virtio: fix get_config / set_config for legacy VirtIO targets

[Dmitry Baryshkov]

The functions virtio_pci_get_config() and virtio_pci_set_config() don't
take the offset into account when reading the config space. For example
this manifests when U-Boot tries to read the MAC address of the VirtIO
networking device. It reads 6 equa bytes instead of the proper addess.

Fix those functions by taking the offset in the config space into
account.

Fixes: 4135e10732a0 ("virtio: Add virtio over pci transport driver")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/virtio/virtio_pci_legacy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index cf5dfb17a94d..aa89604ae84d 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -107,7 +107,7 @@ static int virtio_pci_get_config(struct udevice *udev, unsigned int offset,
 	int i;
 
 	for (i = 0; i < len; i++)
-		ptr[i] = ioread8(ioaddr + i);
+		ptr[i] = ioread8(ioaddr + offset + i);
 
 	return 0;
 }
@@ -121,7 +121,7 @@ static int virtio_pci_set_config(struct udevice *udev, unsigned int offset,
 	int i;
 
 	for (i = 0; i < len; i++)
-		iowrite8(ptr[i], ioaddr + i);
+		iowrite8(ptr[i], ioaddr + offset + i);
 
 	return 0;
 }
-- 
2.39.2