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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-kernel@vger.kernel.org, Amit Shah <amit@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	virtualization@lists.linux-foundation.org,
	stable@vger.kernel.org, Tiwei Bie <tiwei.bie@intel.com>,
	Jason Wang <jasowang@redhat.com>
Subject: Re: [PATCH 1/6] virtio_console: don't tie bufs to a vq
Date: Sat, 21 Apr 2018 09:30:05 +0200	[thread overview]
Message-ID: <20180421073005.GA3744@kroah.com> (raw)
In-Reply-To: <1524248223-393618-2-git-send-email-mst@redhat.com>

On Fri, Apr 20, 2018 at 09:18:01PM +0300, Michael S. Tsirkin wrote:
> an allocated buffer doesn't need to be tied to a vq -
> only vq->vdev is ever used. Pass the function the
> just what it needs - the vdev.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  drivers/char/virtio_console.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
> index 468f061..3e56f32 100644
> --- a/drivers/char/virtio_console.c
> +++ b/drivers/char/virtio_console.c
> @@ -422,7 +422,7 @@ static void reclaim_dma_bufs(void)
>  	}
>  }
>  
> -static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size,
> +static struct port_buffer *alloc_buf(struct virtio_device *vdev, size_t buf_size,
>  				     int pages)
>  {
>  	struct port_buffer *buf;
> @@ -445,16 +445,16 @@ static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size,
>  		return buf;
>  	}
>  
> -	if (is_rproc_serial(vq->vdev)) {
> +	if (is_rproc_serial(vdev)) {
>  		/*
>  		 * Allocate DMA memory from ancestor. When a virtio
>  		 * device is created by remoteproc, the DMA memory is
>  		 * associated with the grandparent device:
>  		 * vdev => rproc => platform-dev.
>  		 */
> -		if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent)
> +		if (!vdev->dev.parent || !vdev->dev.parent->parent)
>  			goto free_buf;
> -		buf->dev = vq->vdev->dev.parent->parent;
> +		buf->dev = vdev->dev.parent->parent;
>  
>  		/* Increase device refcnt to avoid freeing it */
>  		get_device(buf->dev);
> @@ -838,7 +838,7 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
>  
>  	count = min((size_t)(32 * 1024), count);
>  
> -	buf = alloc_buf(port->out_vq, count, 0);
> +	buf = alloc_buf(port->portdev->vdev, count, 0);
>  	if (!buf)
>  		return -ENOMEM;
>  
> @@ -957,7 +957,7 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe,
>  	if (ret < 0)
>  		goto error_out;
>  
> -	buf = alloc_buf(port->out_vq, 0, pipe->nrbufs);
> +	buf = alloc_buf(port->portdev->vdev, 0, pipe->nrbufs);
>  	if (!buf) {
>  		ret = -ENOMEM;
>  		goto error_out;
> @@ -1374,7 +1374,7 @@ static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock)
>  
>  	nr_added_bufs = 0;
>  	do {
> -		buf = alloc_buf(vq, PAGE_SIZE, 0);
> +		buf = alloc_buf(vq->vdev, PAGE_SIZE, 0);
>  		if (!buf)
>  			break;
>  
> -- 
> MST

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>

  reply	other threads:[~2018-04-21  7:30 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-20 18:18 [PATCH 0/6] virtio-console: spec compliance fixes Michael S. Tsirkin
2018-04-20 18:18 ` [PATCH 1/6] virtio_console: don't tie bufs to a vq Michael S. Tsirkin
2018-04-21  7:30   ` Greg Kroah-Hartman [this message]
2018-04-24 18:56     ` Michael S. Tsirkin
2018-04-25  5:50       ` Greg Kroah-Hartman
2018-04-20 18:18 ` [PATCH 3/6] virtio_console: free buffers after reset Michael S. Tsirkin
2018-04-24  2:40   ` Jason Wang
2018-04-20 18:18 ` [PATCH 2/6] virtio: add ability to iterate over vqs Michael S. Tsirkin
2018-04-20 18:18 ` [PATCH 4/6] virtio_console: drop custom control queue cleanup Michael S. Tsirkin
2018-04-20 18:18 ` [PATCH 5/6] virtio_console: move removal code Michael S. Tsirkin
2018-04-20 18:18 ` [PATCH 6/6] virtio_console: reset on out of memory Michael S. Tsirkin
2018-04-24 18:41 ` [PATCH 0/6] virtio-console: spec compliance fixes Michael S. Tsirkin
2018-04-25 14:01   ` Amit Shah
2018-05-03  3:34   ` Amit Shah
2018-05-03  3:45   ` Amit Shah
2018-05-03 19:28     ` Michael S. Tsirkin
2018-05-06 17:56       ` Amit Shah
2018-05-06 18:24       ` Amit Shah
2018-05-06 19:52         ` Michael S. Tsirkin

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