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List: linaro-mm-sig
Subject: Re: [Linaro-mm-sig] [PATCH] dma-buf: remove restriction of IOCTL:DMA_BUF_SET_NAME
From: Randy Dunlap <rdunlap () infradead ! org>
Date: 2021-10-09 4:41:04
Message-ID: c23181a5-b75b-c04b-7cc4-020f2b2b44c1 () infradead ! org
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On 10/8/21 7:47 PM, guangming.cao@mediatek.com wrote:
> From: Guangming Cao <Guangming.Cao@mediatek.com>
>
> If dma-buf don't want userspace users to touch the dmabuf buffer,
> it seems we should add this restriction into dma_buf_ops.mmap,
> not in this IOCTL:DMA_BUF_SET_NAME.
>
> With this restriction, we can only know the kernel users of the dmabuf
> by attachments.
> However, for many userspace users, such as userpsace users of dma_heap,
> they also need to mark the usage of dma-buf, and they don't care about
> who attached to this dmabuf, and seems it's no meaning to waitting for
to be waiting for
> IOCTL:DMA_BUF_SET_NAME rather than mmap.
>
> Signed-off-by: Guangming Cao <Guangming.Cao@mediatek.com>
> ---
> drivers/dma-buf/dma-buf.c | 14 ++------------
> 1 file changed, 2 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index 511fe0d217a0..afbd0a226639 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -325,10 +325,8 @@ static __poll_t dma_buf_poll(struct file *file, poll_table *poll)
>
> /**
> * dma_buf_set_name - Set a name to a specific dma_buf to track the usage.
> - * The name of the dma-buf buffer can only be set when the dma-buf is not
> - * attached to any devices. It could theoritically support changing the
> - * name of the dma-buf if the same piece of memory is used for multiple
> - * purpose between different devices.
> + * It could theoritically support changing the name of the dma-buf if the same
theoretically
(yes, it was incorrect before this change.)
> + * piece of memory is used for multiple purpose between different devices.
> *
> * @dmabuf: [in] dmabuf buffer that will be renamed.
> * @buf: [in] A piece of userspace memory that contains the name of
> @@ -346,19 +344,11 @@ static long dma_buf_set_name(struct dma_buf *dmabuf, const char __user *buf)
> if (IS_ERR(name))
> return PTR_ERR(name);
>
> - dma_resv_lock(dmabuf->resv, NULL);
> - if (!list_empty(&dmabuf->attachments)) {
> - ret = -EBUSY;
> - kfree(name);
> - goto out_unlock;
> - }
> spin_lock(&dmabuf->name_lock);
> kfree(dmabuf->name);
> dmabuf->name = name;
> spin_unlock(&dmabuf->name_lock);
>
> -out_unlock:
> - dma_resv_unlock(dmabuf->resv);
> return ret;
> }
>
>
--
~Randy
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