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Date:   Fri, 2 Jul 2021 10:26:33 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Jie Deng <jie.deng@intel.com>
Cc:     linux-i2c@vger.kernel.org,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, wsa@kernel.org,
        wsa+renesas@sang-engineering.com, mst@redhat.com, arnd@arndb.de,
        jasowang@redhat.com, andriy.shevchenko@linux.intel.com,
        yu1.wang@intel.com, shuo.a.liu@intel.com, conghui.chen@intel.com,
        stefanha@redhat.com
Subject: Re: [PATCH v11] i2c: virtio: add a virtio i2c frontend driver
Message-ID: <20210702045633.gblpud7wcffd5kyj@vireshk-i7>
References: <510c876952efa693339ab0d6cc78ba7be9ef6897.1625104206.git.jie.deng@intel.com>
 <20210701040436.p7kega6rzeqz5tlm@vireshk-i7>
 <cb35472d-f79e-f3f8-405f-35c699d897a1@intel.com>
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On 02-07-21, 11:36, Jie Deng wrote:
> OK. Let's add the following two lines to make sure that msg_buf is only
> sent when the msgs len is not zero. And backend judges whether it is
> a zero-length request by checking the number of elements received.
> 
> ?+ if (msgs[i].len) {
> ?????????? reqs[i].buf = i2c_get_dma_safe_msg_buf(&msgs[i], 1);
> ?????????? if (!reqs[i].buf)
> ?????????????????? break;
> 
> ????????? sg_init_one(&msg_buf, reqs[i].buf, msgs[i].len);
> 
> ????????? if (msgs[i].flags & I2C_M_RD)
> ????????????????? sgs[outcnt + incnt++] = &msg_buf;
> ????????? else
> ????????????????? sgs[outcnt++] = &msg_buf;
> +}

Perfect. Thanks.

-- 
viresh