Re: [PATCH] soundwire: stream: sdw_stream_remove_slave(): Check stream is valid

[Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>]

On 4/30/26 16:33, Richard Fitzgerald wrote:
> In sdw_stream_remove_slave() check that stream is a valid pointer
> before passing it to functions that dereference it. Return 0 if the
> pointer is invalid.
> 
> This is a convenience for callers. They can safely call this function
> during cleanup code without needing a pointer validity check duplicated
> at every call point.
> 
> Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>

LGTM

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>

> ---
>  drivers/soundwire/stream.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index 4ed8fb7663ad..c1ef177a0021 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -2229,11 +2229,15 @@ EXPORT_SYMBOL(sdw_stream_add_slave);
>   * @slave: SDW Slave instance
>   * @stream: SoundWire stream
>   *
> - * This removes and frees port_rt and slave_rt from a stream
> + * This removes and frees port_rt and slave_rt from a stream.
> + * If stream is NULL or an ERR_PTR, do nothing and return 0.
>   */
>  int sdw_stream_remove_slave(struct sdw_slave *slave,
>  			    struct sdw_stream_runtime *stream)
>  {
> +	if (IS_ERR_OR_NULL(stream))
> +		return 0;
> +
>  	mutex_lock(&slave->bus->bus_lock);
>  
>  	sdw_slave_port_free(slave, stream);