Currently we are trying to work out if the vendor id is from a virtio-mmio device and then casting a u32 to a char* and using it as a C-string. By chance there is usually a zero after the u32 and it works.
Since the vendor id we are trying to convert to a string is QEMU's just define a value for the QEMU vendor id, check if the vendor id matches and then use a predefined string for "QEMU". I don't think we should have been assumming all virtio-mmio vendor ids are printable ASCII chars in the first place so do this special casing just for QEMU. If the vendor id isn't QEMU print the hex value of it. Reviewed-by: Simon Glass <[email protected]> Reviewed-by: Kuan-Wei Chiu <[email protected]> Signed-off-by: Daniel Palmer <[email protected]> --- drivers/virtio/virtio_blk.c | 11 ++++------- include/virtio.h | 3 +++ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/virtio/virtio_blk.c b/drivers/virtio/virtio_blk.c index 45fb596a3308..94968ef1c759 100644 --- a/drivers/virtio/virtio_blk.c +++ b/drivers/virtio/virtio_blk.c @@ -231,14 +231,11 @@ static int virtio_blk_bind(struct udevice *dev) return devnum; desc->devnum = devnum; desc->part_type = PART_TYPE_UNKNOWN; - /* - * virtio mmio transport supplies string identification for us, - * while pci trnasport uses a 2-byte subvendor value. - */ - if (uc_priv->vendor >> 16) - sprintf(desc->vendor, "%s", (char *)&uc_priv->vendor); + + if (uc_priv->vendor == VIRTIO_VENDOR_QEMU) + strcpy(desc->vendor, "QEMU"); else - sprintf(desc->vendor, "%04x", uc_priv->vendor); + sprintf(desc->vendor, "%08x", uc_priv->vendor); desc->bdev = dev; /* Indicate what driver features we support */ diff --git a/include/virtio.h b/include/virtio.h index 17f894a79e31..3edf023463d7 100644 --- a/include/virtio.h +++ b/include/virtio.h @@ -25,6 +25,9 @@ #include <linux/bitops.h> #include <linux/bug.h> #include <linux/typecheck.h> + +#define VIRTIO_VENDOR_QEMU 0x554d4551 + #define VIRTIO_ID_NET 1 /* virtio net */ #define VIRTIO_ID_BLOCK 2 /* virtio block */ #define VIRTIO_ID_RNG 4 /* virtio rng */ -- 2.53.0
