linux-kernel - Re: [PATCH 1/2] rpmsg: glink: Propagate TX failures in intentless mode as well

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Date:   Tue, 28 Mar 2023 15:55:17 -0700
From:   Chris Lew <quic_clew@...cinc.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] rpmsg: glink: Propagate TX failures in intentless
 mode as well



On 3/27/2023 7:41 AM, Bjorn Andersson wrote:
> As support for splitting transmision over several messages using
> TX_DATA_CONT was introduced it does not immediately return the return
> value of qcom_glink_tx().
> 
> The result is that in the intentless case (i.e. intent == NULL), the
> code will continue to send all additional chunks. This is wasteful, and
> it's possible that the send operation could incorrectly indicate
> success, if the last chunk fits in the TX fifo.
> 
> Fix the condition.
> 
> Fixes: 8956927faed3 ("rpmsg: glink: Add TX_DATA_CONT command while sending")
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---

s/transmision/transmission

Reviewed-by: Chris Lew <quic_clew@...cinc.com>

>   drivers/rpmsg/qcom_glink_native.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
> index 01d2805fe30f..62634d020d13 100644
> --- a/drivers/rpmsg/qcom_glink_native.c
> +++ b/drivers/rpmsg/qcom_glink_native.c
> @@ -1356,8 +1356,9 @@ static int __qcom_glink_send(struct glink_channel *channel,
>   	ret = qcom_glink_tx(glink, &req, sizeof(req), data, chunk_size, wait);
>   
>   	/* Mark intent available if we failed */
> -	if (ret && intent) {
> -		intent->in_use = false;
> +	if (ret) {
> +		if (intent)
> +			intent->in_use = false;
>   		return ret;
>   	}
>   
> @@ -1378,8 +1379,9 @@ static int __qcom_glink_send(struct glink_channel *channel,
>   				    chunk_size, wait);
>   
>   		/* Mark intent available if we failed */
> -		if (ret && intent) {
> -			intent->in_use = false;
> +		if (ret) {
> +			if (intent)
> +				intent->in_use = false;
>   			break;
>   		}
>   	}
>