On Wed, 2018-08-08 at 22:57 +0200, Wolfram Sang wrote: > On Sat, Jul 07, 2018 at 05:29:54PM +0800, Jun Gao wrote: > > From: Jun Gao <jun.gao@xxxxxxxxxxxx> > > > > This function is needed by i2c_get_dma_safe_msg_buf() potentially. > > It is used to free DMA safe buffer when DMA operation fails. > > > > Signed-off-by: Jun Gao <jun.gao@xxxxxxxxxxxx> > > Right, we need something like this. This leaks in the sh_mobile driver, > too :( > > I am still thinking if there is a nice way to put this functionality > into i2c_release_dma_safe_msg_buf() itself somehow... Wolfram, I have second thought on these API now. Recently, we have saw similar issue for spi device driver. I believe the reason for these api is because some arch changed to can not do DMA on stack recently. Maybe we should have dma_mapping to bounce buffer like it bounce un-dma-able address for those arch? or we should have a common driver API for this, not just for i2c? Joe.C
