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

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Message-ID: <20150327080947.GA900@katana>
Date:	Fri, 27 Mar 2015 09:09:47 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eeprom: at24: Add support for large EEPROMs connected to
 SMBus adapters


> 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)?


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