Messages in this thread | | | Subject | Re: [PATCH v2 2/3] i2c: Add helper to ease DMA handling | From | Yingjoe Chen <> | Date | Thu, 9 Aug 2018 17:13:20 +0800 |
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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@mediatek.com> > > > > 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@mediatek.com> > > 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
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