On Tue, 2003-02-04 at 10:23, Markus Schorer wrote: > 2) i assign a buffer for a single piece of data. reading from the > device, > i wait in a wait queue. > an interrupt schedules a tasklet. the tasklet read the data over i2c, > stores it in the buffer and does a wakeup. > then the read process reads the data out of the buffer. > works. In general, it's wrong to sleep in a tasklet. As I understand it, i2c_master_recv is allowed to sleep (I'm writing my driver on that assumption, somebody correct me if I'm wrong). I think your first version is superior, though if you're targeting 2.4 and 2.5 kernels then a completion is easier than a wait queue. If you want to do a ringbuffer, consider creating a worker thread and using semaphores for producer / consumer scheduling. - Adrian Cox http://www.humboldt.co.uk/
