From: Wolfram Sang <wsa@kernel.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Jie Deng <jie.deng@intel.com>,
linux-i2c@vger.kernel.org,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, 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: Fri, 2 Jul 2021 09:36:48 +0200 [thread overview]
Message-ID: <YN7CEKj9787TTcCT@kunai> (raw)
In-Reply-To: <20210702072127.yzofc75cuuqtvzbn@vireshk-i7>
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On Fri, Jul 02, 2021 at 12:51:27PM +0530, Viresh Kumar wrote:
> On 02-07-21, 15:15, Jie Deng wrote:
> > Then what is the need to design this interface as "return the number of
> > messages successfully
> > processed, or a negative value on error". Just return success or fail is
> > enough.
Let me quote a comment from the I2C core which is there since 2008:
/* REVISIT the fault reporting model here is weak:
*
* - When we get an error after receiving N bytes from a slave,
* there is no way to report "N".
*
* - When we get a NAK after transmitting N bytes to a slave,
* there is no way to report "N" ... or to let the master
* continue executing the rest of this combined message, if
* that's the appropriate response.
*
* - When for example "num" is two and we successfully complete
* the first message but get an error part way through the
* second, it's unclear whether that should be reported as
* one (discarding status on the second message) or errno
* (discarding status on the first one).
*/
> for 5.14-rc1/2.. So it would be better if you resend the next version as soon as
> possible :)
I won't be around for the next two weeks after today.
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next prev parent reply other threads:[~2021-07-02 7:36 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
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 [this message]
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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