Re: [PATCH] eeprom: at24: Add support for large EEPROMs connected to SMBus adapters

[Guenter Roeck]

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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