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| author | Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> | 2019-02-14 17:23:20 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-05 23:33:06 +0300 |
| commit | 7273c2b1e79c042532960bcf55feaec33a288e41 (patch) | |
| tree | 1456f46c32113d5cb859a5f86ccd8c54824eb099 /drivers/xen/gntdev-dmabuf.h | |
| parent | e9cd7f5437640d4af2800c9db8283ec487332c43 (diff) | |
| download | linux-7273c2b1e79c042532960bcf55feaec33a288e41.tar.xz | |
xen/gntdev: Do not destroy context while dma-bufs are in use
[ Upstream commit fa13e665e02874c0a5f4d06d6967ae34a6cb3d6a ]
If there are exported DMA buffers which are still in use and
grant device is closed by either normal user-space close or by
a signal this leads to the grant device context to be destroyed,
thus making it not possible to correctly destroy those exported
buffers when they are returned back to gntdev and makes the module
crash:
[ 339.617540] [<ffff00000854c0d8>] dmabuf_exp_ops_release+0x40/0xa8
[ 339.617560] [<ffff00000867a6e8>] dma_buf_release+0x60/0x190
[ 339.617577] [<ffff0000082211f0>] __fput+0x88/0x1d0
[ 339.617589] [<ffff000008221394>] ____fput+0xc/0x18
[ 339.617607] [<ffff0000080ed4e4>] task_work_run+0x9c/0xc0
[ 339.617622] [<ffff000008089714>] do_notify_resume+0xfc/0x108
Fix this by referencing gntdev on each DMA buffer export and
unreferencing on buffer release.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Boris Ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/xen/gntdev-dmabuf.h')
| -rw-r--r-- | drivers/xen/gntdev-dmabuf.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/gntdev-dmabuf.h b/drivers/xen/gntdev-dmabuf.h index 7220a53d0fc5..3d9b9cf9d5a1 100644 --- a/drivers/xen/gntdev-dmabuf.h +++ b/drivers/xen/gntdev-dmabuf.h @@ -14,7 +14,7 @@ struct gntdev_dmabuf_priv; struct gntdev_priv; -struct gntdev_dmabuf_priv *gntdev_dmabuf_init(void); +struct gntdev_dmabuf_priv *gntdev_dmabuf_init(struct file *filp); void gntdev_dmabuf_fini(struct gntdev_dmabuf_priv *priv); |