linux-kernel - [PATCH v4 1/3] virtio-balloon: remove BUG() in init

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Message-Id: <1534405858-27085-2-git-send-email-wei.w.wang@intel.com>
Date:   Thu, 16 Aug 2018 15:50:56 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        mst@...hat.com, mhocko@...nel.org, akpm@...ux-foundation.org,
        penguin-kernel@...ove.SAKURA.ne.jp
Cc:     wei.w.wang@...el.com
Subject: [PATCH v4 1/3] virtio-balloon: remove BUG() in init_vqs

It's a bit overkill to use BUG when failing to add an entry to the
stats_vq in init_vqs. So remove it and just return the error to the
caller to bail out nicely.

Signed-off-by: Wei Wang <wei.w.wang@...el.com>
Cc: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/virtio/virtio_balloon.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 3988c09..8100e77 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -455,9 +455,13 @@ static int init_vqs(struct virtio_balloon *vb)
 		num_stats = update_balloon_stats(vb);
 
 		sg_init_one(&sg, vb->stats, sizeof(vb->stats[0]) * num_stats);
-		if (virtqueue_add_outbuf(vb->stats_vq, &sg, 1, vb, GFP_KERNEL)
-		    < 0)
-			BUG();
+		err = virtqueue_add_outbuf(vb->stats_vq, &sg, 1, vb,
+					   GFP_KERNEL);
+		if (err) {
+			dev_warn(&vb->vdev->dev, "%s: add stat_vq failed\n",
+				 __func__);
+			return err;
+		}
 		virtqueue_kick(vb->stats_vq);
 	}
 	return 0;
-- 
2.7.4