From: Doug Anderson <dianders@chromium.org>
To: Stephen Boyd <swboyd@chromium.org>
Cc: Wolfram Sang <wsa@the-dreams.de>,
LKML <linux-kernel@vger.kernel.org>,
linux-i2c@vger.kernel.org,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
Karthikeyan Ramasubramanian <kramasub@codeaurora.org>,
Sagar Dharia <sdharia@codeaurora.org>,
Girish Mahadevan <girishm@codeaurora.org>
Subject: Re: [PATCH v2 2/2] i2c: i2c-qcom-geni: Simplify tx/rx functions
Date: Thu, 20 Sep 2018 13:22:37 -0700 [thread overview]
Message-ID: <CAD=FV=U=r0nkT+JO2j4WUHF03ZiJcmaVrzL6dsauDHV=a2m3tQ@mail.gmail.com> (raw)
In-Reply-To: <20180920180323.217377-3-swboyd@chromium.org>
Hi,
On Thu, Sep 20, 2018 at 11:03 AM Stephen Boyd <swboyd@chromium.org> wrote:
>
> We never really look at the 'ret' local variable in these functions, so
> let's remove it to make way for shorter and simpler code. Furthermore,
> we can shorten some lines by adding two local variables for the SE and
> the message length so that everything fits in 80 columns. And kernel
> style is to leave the return statement by itself, detached from the rest
> of the function.
>
> Cc: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
> Cc: Sagar Dharia <sdharia@codeaurora.org>
> Cc: Girish Mahadevan <girishm@codeaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> ---
> drivers/i2c/busses/i2c-qcom-geni.c | 54 ++++++++++++++----------------
> 1 file changed, 25 insertions(+), 29 deletions(-)
I didn't hate the old code, but you're right that this looks a little better.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
NOTE: now that you're cleaning it up, I'd personally go even further
and totally get rid of the "mode" local variable. Basically, just:
dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
if (dma_buf)
geni_se_select_mode(se, GENI_SE_DMA);
else
geni_se_select_mode(se, GENI_SE_FIFO);
...elsewhere just continue to use "dma_buf" being NULL to mean FIFO if
you have to fall back to the FIFO case you set dma_buf to NULL after
calling i2c_put_dma_safe_msg_buf() to indicate to later code that
you're in FIFO mode.
I prototyped this up and the net-net is one fewer line of code and
also the nice consistency that you never hold dma_buf in a pointer
after you've freed it.
-Doug
next prev parent reply other threads:[~2018-09-20 20:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 18:03 [PATCH v2 0/2] Fix qcom geni i2c DMA handling Stephen Boyd
2018-09-20 18:03 ` [PATCH v2 1/2] i2c: i2c-qcom-geni: Properly handle DMA safe buffers Stephen Boyd
2018-09-20 20:22 ` Doug Anderson
2018-09-24 22:13 ` Wolfram Sang
2018-09-20 18:03 ` [PATCH v2 2/2] i2c: i2c-qcom-geni: Simplify tx/rx functions Stephen Boyd
2018-09-20 20:22 ` Doug Anderson [this message]
2018-09-20 22:18 ` Stephen Boyd
2018-09-24 22:13 ` Wolfram Sang
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