linux-kernel - Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver

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Message-ID: <YNraQMl3yJyZ6d5+@kunai>
Date:   Tue, 29 Jun 2021 10:30:56 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Jie Deng <jie.deng@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        conghui.chen@...el.com, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com,
        Sergey Semin <Sergey.Semin@...kalelectronics.ru>,
        Mike Rapoport <rppt@...nel.org>, loic.poulain@...aro.org,
        Tali Perry <tali.perry1@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        yu1.wang@...el.com, shuo.a.liu@...el.com,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver


>     3. It seems the I2C core takes care of locking already, so is it safy to
> remove "struct mutex lock in struct virtio_i2c"?

Looks to me like the mutex is only to serialize calls to
virtio_i2c_xfer(). Then, it can go. The core does locking. See, we have
i2c_transfer and __i2c_transfer, the unlocked version.


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