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
Date: Thu, 1 Jul 2021 11:48:46 +0530 [thread overview]
Message-ID: <20210701061846.7u4zorimzpmb66v7@vireshk-i7> (raw)
In-Reply-To: <cb35472d-f79e-f3f8-405f-35c699d897a1@intel.com>
On 01-07-21, 14:10, Jie Deng wrote:
> I think a fixed number of sgs will make things easier to develop backend.
Yeah, but it looks awkward to send a message buffer which isn't used
at all. From protocol's point of view, it just looks wrong/buggy.
The backend can just look at the number of elements received, they
can either be 2 (in case of zero-length) transfer, or 3 (for
read/write) and any other number is invalid.
> If you prefer to parse the number of descriptors instead of using the msg
> length to
>
> distinguish the zero-length request from other requests, I'm OK to set a
> limit.
My concern is more about the specification here first.
> if (!msgs[i].len) {
> 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;
> }
> > > +#ifdef CONFIG_PM_SLEEP
> > You could avoid this pair of ifdef by creating dummy versions of below
> > routines for !CONFIG_PM_SLEEP case. Up to you.
>
>
> Thank you. I'd like to keep the same.
Sure.
--
viresh
next prev parent reply other threads:[~2021-07-01 6:18 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-01 3:24 [PATCH v11] i2c: virtio: add a virtio i2c frontend driver Jie Deng
2021-07-01 4:04 ` Viresh Kumar
2021-07-01 6:10 ` Jie Deng
2021-07-01 6:18 ` Viresh Kumar [this message]
2021-07-02 3:36 ` Jie Deng
2021-07-02 4:56 ` Viresh Kumar
2021-07-01 19:24 ` Wolfram Sang
2021-07-02 4:55 ` Viresh Kumar
2021-07-02 6:22 ` Wolfram Sang
2021-07-02 6:52 ` Jie Deng
2021-07-02 6:56 ` Viresh Kumar
2021-07-02 7:11 ` Wolfram Sang
2021-07-02 7:15 ` Jie Deng
2021-07-02 7:21 ` Viresh Kumar
2021-07-02 7:36 ` Wolfram Sang
2021-07-01 8:50 ` kernel test robot
2021-07-01 10:00 ` kernel test robot
2021-07-02 3:12 ` Jie Deng
2021-07-02 6:38 ` [kbuild-all] " Rong Chen
2021-07-01 10:45 ` Andy Shevchenko
2021-07-02 1:05 ` Jie Deng
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