linux-kernel - Re: [PATCH v2 3/5] soundwire: stream: Remove unneeded checks for NULL bus

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Date:   Fri, 2 Jun 2023 09:57:13 -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 3/5] soundwire: stream: Remove unneeded checks for NULL
 bus



On 6/2/23 05:11, Charles Keepax wrote:
> Version of the code prior to commit d014688eb373 ("soundwire: stream:
> remove bus->dev from logs on multiple buses"), used bus->dev in the
> error message after do_bank_switch, this necessitated some checking to
> ensure the bus pointer was valid. As the code no longer uses bus->dev
> said checking is now redundant, so remove it.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>

Good cleanup, thanks

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

> ---
> 
> Changes since v1:
>  - Left the duplicate error prints in.
> 
> Thanks,
> Charles
> 
>  drivers/soundwire/stream.c | 14 ++------------
>  1 file changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index 379228f221869..6595f47b403b5 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -1338,7 +1338,7 @@ static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
>  			       bool update_params)
>  {
>  	struct sdw_master_runtime *m_rt;
> -	struct sdw_bus *bus = NULL;
> +	struct sdw_bus *bus;
>  	struct sdw_master_prop *prop;
>  	struct sdw_bus_params params;
>  	int ret;
> @@ -1382,11 +1382,6 @@ static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
>  		}
>  	}
>  
> -	if (!bus) {
> -		pr_err("Configuration error in %s\n", __func__);
> -		return -EINVAL;
> -	}
> -
>  	ret = do_bank_switch(stream);
>  	if (ret < 0) {
>  		pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);
> @@ -1467,7 +1462,7 @@ EXPORT_SYMBOL(sdw_prepare_stream);
>  static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
>  {
>  	struct sdw_master_runtime *m_rt;
> -	struct sdw_bus *bus = NULL;
> +	struct sdw_bus *bus;
>  	int ret;
>  
>  	/* Enable Master(s) and Slave(s) port(s) associated with stream */
> @@ -1490,11 +1485,6 @@ static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
>  		}
>  	}
>  
> -	if (!bus) {
> -		pr_err("Configuration error in %s\n", __func__);
> -		return -EINVAL;
> -	}
> -
>  	ret = do_bank_switch(stream);
>  	if (ret < 0) {
>  		pr_err("%s: do_bank_switch failed: %d\n", __func__, ret);