linux-kernel - Re: [PATCH 4/4] remoteproc: Get rid of tedious error path

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Date:   Mon, 13 Apr 2020 15:56:55 -0500
From:   Alex Elder <elder@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        bjorn.andersson@...aro.org, ohad@...ery.com
Cc:     s-anna@...com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] remoteproc: Get rid of tedious error path

On 4/13/20 2:34 PM, Mathieu Poirier wrote:
> Get rid of tedious error management by moving firmware and operation
> allocation after calling device_initialize().  That way we take advantage
> of the automatic call to rproc_type_release() to cleanup after ourselves
> when put_device() is called.

Looks good to me.

Reviewed-by: Alex Elder <elder@...aro.org>

> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/remoteproc/remoteproc_core.c | 22 +++++++++-------------
>  1 file changed, 9 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index c272d78f07e8..10009b95867a 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -2061,12 +2061,6 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
>  	if (!rproc)
>  		return NULL;
>  
> -	if (rproc_alloc_firmware(rproc, name, firmware))
> -		goto free_rproc;
> -
> -	if (rproc_alloc_ops(rproc, ops))
> -		goto free_firmware;
> -
>  	rproc->name = name;
>  	rproc->priv = &rproc[1];
>  	rproc->auto_boot = true;
> @@ -2079,12 +2073,17 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
>  	rproc->dev.driver_data = rproc;
>  	idr_init(&rproc->notifyids);
>  
> +	if (rproc_alloc_firmware(rproc, name, firmware))
> +		goto out;
> +
> +	if (rproc_alloc_ops(rproc, ops))
> +		goto out;
> +
>  	/* Assign a unique device index and name */
>  	rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
>  	if (rproc->index < 0) {
>  		dev_err(dev, "ida_simple_get failed: %d\n", rproc->index);
> -		put_device(&rproc->dev);
> -		return NULL;
> +		goto out;
>  	}
>  
>  	dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);
> @@ -2105,11 +2104,8 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
>  	rproc->state = RPROC_OFFLINE;
>  
>  	return rproc;
> -
> -free_firmware:
> -	kfree(rproc->firmware);
> -free_rproc:
> -	kfree(rproc);
> +out:
> +	put_device(&rproc->dev);
>  	return NULL;
>  }
>  EXPORT_SYMBOL(rproc_alloc);
>