linux-kernel - Re: [PATCH 1/2] soundwire: cadence: Fix error check in cdns_xfer

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Date:   Mon, 19 Sep 2022 10:48:01 +0200
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>, vkoul@...nel.org,
        yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com
Cc:     patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] soundwire: cadence: Fix error check in
 cdns_xfer_msg()



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@...nsource.cirrus.com>

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

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;
>  	}
>