On 02-07-21, 14:52, Jie Deng wrote: > This is not efficient. If adding the ith request to the queue fails, we can > still send > > the requests before it. Not really. Normally the requests which are sent together by clients, are linked together, like a state machine. So if the first one is sent, but not the second one, then there is not going to be any meaningful result of that. The i2c core doesn't club requests together from different clients in a single i2c_transfer() call. So you must assume i2c_transfer(), irrespective of the number of underlying messages in it, as atomic. If you fail, the client is going to retry everything again or assume it failed completely. > We don't need to know if it fails here (adding to > the queue) > > or there (later in the host). The "master_xfer" just need to return final > number of > > messages successfully processed. No, that isn't going to help and it is rather inefficient, trying to send transfer when we already know part of it failed. -- viresh
