On 03/27/2015 01:09 AM, Wolfram Sang wrote:
just to give you an update: I do have some code, but it is a bit messy,
and it doesn't work well for ds2482 (the chip behind it still hangs up
if I access it in parallel through i2c-dev). On top of that, it causes
pretty significant slow-downs when accessing other devices on the same
bus at the same time. Not surprising, I guess, since it expands the scope
of the bus lock significantly.
Just to get a better idea: Did you try taking the adapter_lock before
the two SMBus command which needed to be concatenated (and use
smbus_xfer directly)?
I did. I didn't use smbus_xfer directly, though, but introduced lockless
versions of the various smbus commands, and kept using those.
Guenter
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