[PATCH v4 25/25] virtio-rng: refactor probe error handling

Michael S. Tsirkin
2014-10-13T07:51:49Z

Code like
vi->vq = NULL;
kfree(vi)
does not make sense.

Clean it up, use goto error labels for cleanup.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
drivers/char/hw_random/virtio-rng.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
index 132c9cc..72295ea 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -109,8 +109,8 @@ static int probe_common(struct virtio_device *vdev)

vi->index = index = ida_simple_get(&rng_index_ida, 0, 0, GFP_KERNEL);
if (index < 0) {
- kfree(vi);
- return index;
+ err = index;
+ goto err_ida;
}
sprintf(vi->name, "virtio_rng.%d", index);
init_completion(&vi->have_data);
@@ -128,13 +128,16 @@ static int probe_common(struct virtio_device *vdev)
vi->vq = virtio_find_single_vq(vdev, random_recv_done, "input");
if (IS_ERR(vi->vq)) {
err = PTR_ERR(vi->vq);
- vi->vq = NULL;
- kfree(vi);
- ida_simple_remove(&rng_index_ida, index);
- return err;
+ goto err_find;
}

return 0;
+
+err_find:
+ ida_simple_remove(&rng_index_ida, index);
+err_ida:
+ kfree(vi);
+ return err;
}

static void remove_common(struct virtio_device *vdev)
--
MST