From: Xianting Tian <xianting.tian@linux.alibaba.com>
Date: Fri, 9 Jun 2023 13:18:16 +0000 (+0800)
Subject: virtio-console: call scheduler when we free unused buffs
X-Git-Tag: v6.6.7~2443^2~20
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=56b5e65efe0001fb5f95e412ee4167363debfc46;p=platform%2Fkernel%2Flinux-starfive.git

virtio-console: call scheduler when we free unused buffs

For virtio-net we were getting CPU stall warnings, and fixed it by
calling the scheduler: see f8bb51043945 ("virtio_net: suppress cpu stall
when free_unused_bufs").

This driver is similar so theoretically the same logic applies.

Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Message-Id: <20230609131817.712867-3-xianting.tian@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index b65c809..5ec4cf4 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1935,6 +1935,7 @@ static void remove_vqs(struct ports_device *portdev)
 		flush_bufs(vq, true);
 		while ((buf = virtqueue_detach_unused_buf(vq)))
 			free_buf(buf, true);
+		cond_resched();
 	}
 	portdev->vdev->config->del_vqs(portdev->vdev);
 	kfree(portdev->in_vqs);