On Thu, 7 Jan 2021 22:02:48 +0100 Wolfram Sang <w...@kernel.org> wrote:
> > My question is whether this is allowed, whether the msgs array passed > > to the i2c_transfer() function can have multiple msgs pointing to the > > same buffer (the one into which the original page is first stored > > with first i2c_msg and then restored from it in the last i2c_msg). > > Sending the messages is serialized, so the buffers won't interfere. At > first glance, I think it would work this way. But it's late evening > here, so I will have another look again tomorrow. > I thought as much, but maybe there is some driver which can offload whole i2c_transfer to HW, and has to pass the addresses of the buffers to the HW, and the HW can have problems if the buffers overlap somewhere... Marek
