Re: [PATCH 1/2] soundwire: cadence: Fix error check in cdns_xfer_msg()

[Pierre-Louis Bossart]

On 9/17/22 17:48, Richard Fitzgerald wrote:
> _cdns_xfer_msg() returns an sdw_command_response value, not a
> negative error code.
> 
> Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>

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

we've got other issues like this such as

enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus *bus,
		    struct sdw_msg *msg, struct sdw_defer *defer)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int cmd = 0, ret;

	/* for defer only 1 message is supported */
	if (msg->len > 1)
		return -ENOTSUPP; <<< that's not right


We should probably double-check that all functions return enums don't
return negative values.

> ---
>  drivers/soundwire/cadence_master.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
> index ca241bbeadd9..3543a923ee6b 100644
> --- a/drivers/soundwire/cadence_master.c
> +++ b/drivers/soundwire/cadence_master.c
> @@ -708,7 +708,7 @@ cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
>  	for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
>  		ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
>  				     CDNS_MCP_CMD_LEN, false);
> -		if (ret < 0)
> +		if (ret != SDW_CMD_OK)
>  			goto exit;
>  	}
>