Messages in this thread | | | Date | Wed, 21 Dec 2005 16:22:27 +0300 | From | Vitaly Wool <> | Subject | Re: [PATCH/RFC] SPI core: turn transfers to be linked list |
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David Brownell wrote:
>>The list setting commands are pretty essential and will not add a lot to >>the assembly code. >> >> > >I'm not totally averse to such changes, but you don't seem to be making >the best arguments. Example: they're clearly not "essential" because >transfer queues work today with the lists at the spi_message level. > > One more reason for that that came out only recently: suppore we're adding transfers to an already configured message (i. e. with some transfers set up already). This 'chaning' may happen for some kinds of devices. And in case transfers is an array, we should either be apriory aware of whether the chaining will take place or allocate an array large enough to hold additional transfers. Neither of these look good to me, and having a linked list of transfers will definitely solve this problem.
Vitaly
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