linux-kernel - Re: [PATCH v6 1/3] rpmsg: core: Add wildcard match for name service

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Date:   Mon, 8 Jun 2020 16:11:34 -0500
From:   Suman Anna <s-anna@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>, <ohad@...ery.com>,
        <bjorn.andersson@...aro.org>
CC:     <arnaud.pouliquen@...com>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/3] rpmsg: core: Add wildcard match for name service

On 5/15/20 3:56 PM, Mathieu Poirier wrote:
> Adding the capability to supplement the base definition published
> by an rpmsg_driver with a postfix description so that it is possible
> for several entity to use the same service.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Acked-by: Arnaud Pouliquen <arnaud.pouliquen@...com>

Going back to my review and testing done back on v2,

Acked-by: Suman Anna <s-anna@...com>

regards
Suman

> ---
>   drivers/rpmsg/rpmsg_core.c | 20 +++++++++++++++++++-
>   1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index a6361cad608b..5e01e8dede6b 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -399,7 +399,25 @@ ATTRIBUTE_GROUPS(rpmsg_dev);
>   static inline int rpmsg_id_match(const struct rpmsg_device *rpdev,
>   				  const struct rpmsg_device_id *id)
>   {
> -	return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
> +	size_t len = min_t(size_t, strlen(id->name), RPMSG_NAME_SIZE);
> +
> +	/*
> +	 * Allow for wildcard matches.  For example if rpmsg_driver::id_table
> +	 * is:
> +	 *
> +	 * static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
> +	 *      { .name = "rpmsg-client-sample" },
> +	 *      { },
> +	 * }
> +	 *
> +	 * Then it is possible to support "rpmsg-client-sample*", i.e:
> +	 *	rpmsg-client-sample
> +	 *	rpmsg-client-sample_instance0
> +	 *	rpmsg-client-sample_instance1
> +	 *	...
> +	 *	rpmsg-client-sample_instanceX
> +	 */
> +	return strncmp(id->name, rpdev->id.name, len) == 0;
>   }
>   
>   /* match rpmsg channel and rpmsg driver */
>