[Devel] [PATCH RH9 v4 01/10] drivers/vhost: vhost-blk accelerator for virtio-blk guests

[Pavel Tikhomirov]

On 01.11.2022 10:25, Andrey Zhadchenko wrote:
> +/* It is forbidden to call more than one vhost_blk_flush() simultaneously */

Let's add at least a warning for this case:

> +static void vhost_blk_flush(struct vhost_blk *blk)
> +{
> +	int flush_bin;
> +
> +	spin_lock(&blk->flush_lock);

WARN_ON(blk->during_flush);

> +	blk->during_flush = 1;

Because in the case of two flushes, first flush can hang infinitely 
waiting for its flush_bin to get empty.

-- 
Best regards, Tikhomirov Pavel
Software Developer, Virtuozzo.