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xen/gntdev-dmabuf: Ditch dummy map functions 

There's no in-kernel users for the k(un)map stuff. And the mmap one is
actively harmful - return 0 and then _not_ actually mmaping can't end
well.

Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: xen-devel@lists.xenproject.org
Link: https://patchwork.freedesktop.org/patch/msgid/20191118103536.17675-14-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2019-11-18 11:35:34 +01:00
parent 42aa7c6eb3
commit dea8c09c32
1 changed files with 0 additions and 23 deletions
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23
drivers/xen/gntdev-dmabuf.c
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@ -342,35 +342,12 @@ static void dmabuf_exp_ops_release(struct dma_buf *dma_buf)
mutex_unlock(&priv->lock);
}
static void *dmabuf_exp_ops_kmap(struct dma_buf *dma_buf,
unsigned long page_num)
{
/* Not implemented. */
return NULL;
}
static void dmabuf_exp_ops_kunmap(struct dma_buf *dma_buf,
unsigned long page_num, void *addr)
{
/* Not implemented. */
}
static int dmabuf_exp_ops_mmap(struct dma_buf *dma_buf,
struct vm_area_struct *vma)
{
/* Not implemented. */
return 0;
}
static const struct dma_buf_ops dmabuf_exp_ops = {
.attach = dmabuf_exp_ops_attach,
.detach = dmabuf_exp_ops_detach,
.map_dma_buf = dmabuf_exp_ops_map_dma_buf,
.unmap_dma_buf = dmabuf_exp_ops_unmap_dma_buf,
.release = dmabuf_exp_ops_release,
.map = dmabuf_exp_ops_kmap,
.unmap = dmabuf_exp_ops_kunmap,
.mmap = dmabuf_exp_ops_mmap,
};
struct gntdev_dmabuf_export_args {