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| author | Michael S. Tsirkin <mst@redhat.com> | 2015-01-12 16:23:37 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-01-21 16:28:46 +1030 |
| commit | 011f0e7a6944855436fb29c7a7e6c3c89c95f8fb (patch) | |
| tree | 20513dda94177be3306922cbfc10a9a9679223e9 | |
| parent | a4379fd841cc1af60ef495b8e5598b1f7327ec0c (diff) | |
| download | linux-011f0e7a6944855436fb29c7a7e6c3c89c95f8fb.tar.gz linux-011f0e7a6944855436fb29c7a7e6c3c89c95f8fb.tar.bz2 linux-011f0e7a6944855436fb29c7a7e6c3c89c95f8fb.zip | |
virtio/console: verify device has config space
Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/console needs config space access so make it
fail gracefully if not there.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | drivers/char/virtio_console.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index de03df9dd7c9..26afb56a8073 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1986,6 +1986,12 @@ static int virtcons_probe(struct virtio_device *vdev) bool multiport; bool early = early_put_chars != NULL; + if (!vdev->config->get) { + dev_err(&vdev->dev, "%s failure: config access disabled\n", + __func__); + return -EINVAL; + } + /* Ensure to read early_put_chars now */ barrier(); |