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Message-ID: <40d09b30-3323-f438-0f12-bc322ee389e9@linux.intel.com>
Date: Thu, 1 Jun 2023 11:37:33 -0500
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Charles Keepax <ckeepax@...nsource.cirrus.com>, vkoul@...nel.org
Cc: yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com,
alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
patches@...nsource.cirrus.com
Subject: Re: [PATCH 3/4] soundwire: stream: Remove unnecessary gotos
On 6/1/23 11:16, Charles Keepax wrote:
> There is a lot of code using gotos to skip small sections of code, this
> is a fairly dubious use of a goto, especially when the level of
> intentation is really low. Most of this code doesn't even breach 80
> characters when naively shifted over.
>
> Simplify the code a bit, by replacing these unnecessary gotos with
> simple ifs.
it's probably ok but far from simple to review with the inverted states
for variables. I don't have the time and energy to revisit this...
I would err on the side of if it ain't broke don't fix it here.
> Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> ---
> drivers/soundwire/stream.c | 131 +++++++++++++++++--------------------
> 1 file changed, 59 insertions(+), 72 deletions(-)
>
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index 379228f221869..248ab243ec6e4 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -1355,25 +1355,23 @@ static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
> return -EINVAL;
> }
>
> - if (!update_params)
> - goto program_params;
> -
> - /* Increment cumulative bus bandwidth */
> - /* TODO: Update this during Device-Device support */
> - bus->params.bandwidth += m_rt->stream->params.rate *
> - m_rt->ch_count * m_rt->stream->params.bps;
> -
> - /* Compute params */
> - if (bus->compute_params) {
> - ret = bus->compute_params(bus);
> - if (ret < 0) {
> - dev_err(bus->dev, "Compute params failed: %d\n",
> - ret);
> - goto restore_params;
> + if (update_params) {
> + /* Increment cumulative bus bandwidth */
> + /* TODO: Update this during Device-Device support */
> + bus->params.bandwidth += m_rt->stream->params.rate *
> + m_rt->ch_count * m_rt->stream->params.bps;
> +
> + /* Compute params */
> + if (bus->compute_params) {
> + ret = bus->compute_params(bus);
> + if (ret < 0) {
> + dev_err(bus->dev, "Compute params failed: %d\n",
> + ret);
> + goto restore_params;
> + }
> }
> }
>
> -program_params:
> /* Program params */
> ret = sdw_program_params(bus, true);
> if (ret < 0) {
> @@ -1864,7 +1862,7 @@ int sdw_stream_add_master(struct sdw_bus *bus,
> struct sdw_stream_runtime *stream)
> {
> struct sdw_master_runtime *m_rt;
> - bool alloc_master_rt = true;
> + bool alloc_master_rt = false;
> int ret;
>
> mutex_lock(&bus->bus_lock);
> @@ -1886,30 +1884,25 @@ int sdw_stream_add_master(struct sdw_bus *bus,
> * it first), if so skip allocation and go to configuration
> */
> m_rt = sdw_master_rt_find(bus, stream);
> - if (m_rt) {
> - alloc_master_rt = false;
> - goto skip_alloc_master_rt;
> - }
> -
> - m_rt = sdw_master_rt_alloc(bus, stream);
> if (!m_rt) {
> - dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
> - __func__, stream->name);
> - ret = -ENOMEM;
> - goto unlock;
> - }
> -skip_alloc_master_rt:
> -
> - if (sdw_master_port_allocated(m_rt))
> - goto skip_alloc_master_port;
> + m_rt = sdw_master_rt_alloc(bus, stream);
> + if (!m_rt) {
> + dev_err(bus->dev, "%s: Master runtime alloc failed for stream:%s\n",
> + __func__, stream->name);
> + ret = -ENOMEM;
> + goto unlock;
> + }
>
> - ret = sdw_master_port_alloc(m_rt, num_ports);
> - if (ret)
> - goto alloc_error;
> + alloc_master_rt = true;
> + }
>
> - stream->m_rt_count++;
> + if (!sdw_master_port_allocated(m_rt)) {
> + ret = sdw_master_port_alloc(m_rt, num_ports);
> + if (ret)
> + goto alloc_error;
>
> -skip_alloc_master_port:
> + stream->m_rt_count++;
> + }
>
> ret = sdw_master_rt_config(m_rt, stream_config);
> if (ret < 0)
> @@ -1990,8 +1983,8 @@ int sdw_stream_add_slave(struct sdw_slave *slave,
> {
> struct sdw_slave_runtime *s_rt;
> struct sdw_master_runtime *m_rt;
> - bool alloc_master_rt = true;
> - bool alloc_slave_rt = true;
> + bool alloc_master_rt = false;
> + bool alloc_slave_rt = false;
>
> int ret;
>
> @@ -2002,47 +1995,41 @@ int sdw_stream_add_slave(struct sdw_slave *slave,
> * and go to configuration
> */
> m_rt = sdw_master_rt_find(slave->bus, stream);
> - if (m_rt) {
> - alloc_master_rt = false;
> - goto skip_alloc_master_rt;
> - }
> -
> - /*
> - * If this API is invoked by Slave first then m_rt is not valid.
> - * So, allocate m_rt and add Slave to it.
> - */
> - m_rt = sdw_master_rt_alloc(slave->bus, stream);
> if (!m_rt) {
> - dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
> - __func__, stream->name);
> - ret = -ENOMEM;
> - goto unlock;
> - }
> + /*
> + * If this API is invoked by Slave first then m_rt is not valid.
> + * So, allocate m_rt and add Slave to it.
> + */
> + m_rt = sdw_master_rt_alloc(slave->bus, stream);
> + if (!m_rt) {
> + dev_err(&slave->dev, "%s: Master runtime alloc failed for stream:%s\n",
> + __func__, stream->name);
> + ret = -ENOMEM;
> + goto unlock;
> + }
>
> -skip_alloc_master_rt:
> - s_rt = sdw_slave_rt_find(slave, stream);
> - if (s_rt) {
> - alloc_slave_rt = false;
> - goto skip_alloc_slave_rt;
> + alloc_master_rt = true;
> }
>
> - s_rt = sdw_slave_rt_alloc(slave, m_rt);
> + s_rt = sdw_slave_rt_find(slave, stream);
> if (!s_rt) {
> - dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n", stream->name);
> - alloc_slave_rt = false;
> - ret = -ENOMEM;
> - goto alloc_error;
> - }
> + s_rt = sdw_slave_rt_alloc(slave, m_rt);
> + if (!s_rt) {
> + dev_err(&slave->dev, "Slave runtime alloc failed for stream:%s\n",
> + stream->name);
> + ret = -ENOMEM;
> + goto alloc_error;
> + }
>
> -skip_alloc_slave_rt:
> - if (sdw_slave_port_allocated(s_rt))
> - goto skip_port_alloc;
> + alloc_slave_rt = true;
> + }
>
> - ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
> - if (ret)
> - goto alloc_error;
> + if (!sdw_slave_port_allocated(s_rt)) {
> + ret = sdw_slave_port_alloc(slave, s_rt, num_ports);
> + if (ret)
> + goto alloc_error;
> + }
>
> -skip_port_alloc:
> ret = sdw_master_rt_config(m_rt, stream_config);
> if (ret)
> goto unlock;
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