Thank you for your comment. > > On Wed, Sep 08, 2021 at 03:16:09PM +0900, Shunsuke Mie wrote: > > To share memory space using dma-buf, a API of the dma-buf requires dma > > device, but devices such as rxe do not have a dma device. For those case, > > change to specify a device of struct ib instead of the dma device. > > So if dma-buf doesn't actually need a device to dma map why do we ever > pass the dma_device here? Something does not add up. As described in the dma-buf api guide [1], the dma_device is used by dma-buf exporter to know the device buffer constraints of importer. [1] https://lwn.net/Articles/489703/
