On 14/02/2019 15:23, Oleksandr Andrushchenko wrote: > From: Oleksandr Andrushchenko <oleksandr_andrushche...@epam.com> > > 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_andrushche...@epam.com>
Applied to xen/tip.git for-linus-5.1 Juergen
