[Qemu-devel] [PATCH] virtio-blk: Check return value of blk_aio_ioctl

[Fam Zheng]

Since commit 1dc936aa84 (virtio-blk: Use blk_aio_ioctl) we silently lose
the request if blk_aio_ioctl returns NULL (not implemented).

Fix it by directly returning VIRTIO_BLK_S_UNSUPP as we used to do.

Signed-off-by: Fam Zheng <address@hidden>
---
 hw/block/virtio-blk.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 1a8a176..c7c8f20 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -197,6 +197,7 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
     VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
     VirtQueueElement *elem = &req->elem;
     VirtIOBlock *blk = req->dev;
+    BlockAIOCB *acb;
 
 #ifdef __linux__
     int i;
@@ -278,8 +279,12 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
     ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
     ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
 
-    blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
-                  virtio_blk_ioctl_complete, ioctl_req);
+    acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
+                        virtio_blk_ioctl_complete, ioctl_req);
+    if (!acb) {
+        status = VIRTIO_BLK_S_UNSUPP;
+        goto fail;
+    }
     return -EINPROGRESS;
 #else
     abort();
-- 
2.1.0