netdev - Re: question about i2c_transfer() function (regarding mdio-i2c on RollBall SFPs)

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Message-ID: <20210107210248.GA894@kunai>
Date:   Thu, 7 Jan 2021 22:02:48 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Marek Behun <marek.behun@....cz>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        Pali Rohár <pali@...nel.org>,
        linux-i2c@...r.kernel.org
Subject: Re: question about i2c_transfer() function (regarding mdio-i2c on
 RollBall SFPs)


> My question is whether this is allowed, whether the msgs array passed
> to the i2c_transfer() function can have multiple msgs pointing to the
> same buffer (the one into which the original page is first stored
> with first i2c_msg and then restored from it in the last i2c_msg).

Sending the messages is serialized, so the buffers won't interfere. At
first glance, I think it would work this way. But it's late evening
here, so I will have another look again tomorrow.


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