linux-kernel - Re: [Xen-devel][PATCH 1/2] xen/gntdev: Do not destroy context while dma-bufs are in use

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Date:   Fri, 15 Feb 2019 17:29:20 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Oleksandr Andrushchenko <andr2000@...il.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [Xen-devel][PATCH 1/2] xen/gntdev: Do not destroy context while
 dma-bufs are in use

On 15/02/2019 16:35, Oleksandr Andrushchenko wrote:
> On 2/15/19 5:28 PM, Boris Ostrovsky wrote:
>> On 2/15/19 10:07 AM, Oleksandr Andrushchenko wrote:
>>> On 2/15/19 5:03 PM, Boris Ostrovsky wrote:
>>>> On 2/14/19 9:23 AM, Oleksandr Andrushchenko wrote:
>>>>>      /* DMA buffer export support. */
>>>>> @@ -311,6 +317,7 @@ static void dmabuf_exp_release(struct kref *kref)
>>>>>          dmabuf_exp_wait_obj_signal(gntdev_dmabuf->priv,
>>>>> gntdev_dmabuf);
>>>>>        list_del(&gntdev_dmabuf->next);
>>>>> +    fput(gntdev_dmabuf->priv->filp);
>>>>>        kfree(gntdev_dmabuf);
>>>>>    }
>>>>>    @@ -423,6 +430,7 @@ static int dmabuf_exp_from_pages(struct
>>>>> gntdev_dmabuf_export_args *args)
>>>>>        mutex_lock(&args->dmabuf_priv->lock);
>>>>>        list_add(&gntdev_dmabuf->next, &args->dmabuf_priv->exp_list);
>>>>>        mutex_unlock(&args->dmabuf_priv->lock);
>>>>> +    get_file(gntdev_dmabuf->priv->filp);
>>>> Not fget()?
>>> fget wants file descriptor [1] and returns struct file *,
>>> but we already have struct file*, so I use get_file [2]
>>> which does what I need - increments the reference counter
>>> on the file
>>
>> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Thank you,
> any chance we can get this for 5.1?
> 

Yes.


Juergen