linux-kernel - Re: [PATCH v2 4/5] soundwire: stream: Invert logic on runtime alloc flags

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Date:   Fri, 2 Jun 2023 10:01:20 -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 v2 4/5] soundwire: stream: Invert logic on runtime alloc
 flags



On 6/2/23 05:11, Charles Keepax wrote:
> sdw_stream_add_slave/master have flags to indicate if the master or
> slave runtime where allocated in that call to the function. Currently
> these flags are cleared on all the paths where the runtime is not
> allocated, it is more logic and simpler to set the flag on the one path
> where the runtime is allocated.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>

Much easier to review indeed, thanks!

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

> ---
> 
> Changes since v1:
>  - Split out of the goto patch to ease review
> 
> Also worth noting I guess this patch could be squashed with patch 1 in
> the series really, but I opted to leave them separate as patch 1 is a
> much simpler fix to be cherry-picked back to older kernels if someone
> needs the fixup, rather than mixing the fixup and tidy up.
> 
> Thanks,
> Charles
> 
>  drivers/soundwire/stream.c | 25 ++++++++++++-------------
>  1 file changed, 12 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index 6595f47b403b5..df5600a80c174 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -1854,7 +1854,7 @@ 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);
> @@ -1876,10 +1876,8 @@ 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;
> +	if (m_rt)
>  		goto skip_alloc_master_rt;
> -	}
>  
>  	m_rt = sdw_master_rt_alloc(bus, stream);
>  	if (!m_rt) {
> @@ -1888,6 +1886,8 @@ int sdw_stream_add_master(struct sdw_bus *bus,
>  		ret = -ENOMEM;
>  		goto unlock;
>  	}
> +
> +	alloc_master_rt = true;
>  skip_alloc_master_rt:
>  
>  	if (sdw_master_port_allocated(m_rt))
> @@ -1980,8 +1980,8 @@ 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;
>  
> @@ -1992,10 +1992,8 @@ 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;
> +	if (m_rt)
>  		goto skip_alloc_master_rt;
> -	}
>  
>  	/*
>  	 * If this API is invoked by Slave first then m_rt is not valid.
> @@ -2009,21 +2007,22 @@ int sdw_stream_add_slave(struct sdw_slave *slave,
>  		goto unlock;
>  	}
>  
> +	alloc_master_rt = true;
> +
>  skip_alloc_master_rt:
>  	s_rt = sdw_slave_rt_find(slave, stream);
> -	if (s_rt) {
> -		alloc_slave_rt = false;
> +	if (s_rt)
>  		goto skip_alloc_slave_rt;
> -	}
>  
>  	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);
> -		alloc_slave_rt = false;
>  		ret = -ENOMEM;
>  		goto alloc_error;
>  	}
>  
> +	alloc_slave_rt = true;
> +
>  skip_alloc_slave_rt:
>  	if (sdw_slave_port_allocated(s_rt))
>  		goto skip_port_alloc;