blockdev: Remove IF_* check for read-only blockdev_init

IF_NONE allows read-only, which makes forbidding it in this place
for other types pretty much pointless.

Instead, make sure that all devices for which the check would have
errored out check in their init function that they don't get a read-only
BlockDriverState. This catches even cases where IF_NONE and -device is
used.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index d47e2377f9..1bb56c4d54 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -246,6 +246,9 @@ static int ssi_sd_init(SSISlave *dev)
     s->mode = SSI_SD_CMD;
     dinfo = drive_get_next(IF_SD);
     s->sd = sd_init(dinfo ? dinfo->bdrv : NULL, true);
+    if (s->sd == NULL) {
+        return -1;
+    }
     register_savevm(&dev->qdev, "ssi_sd", -1, 1, ssi_sd_save, ssi_sd_load, s);
     return 0;
 }