linux-kernel - Re: [PATCH] staging: bcm2835-camera: Replace open-coded idr with a struct idr.

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Date:   Tue, 15 May 2018 15:04:46 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH] staging: bcm2835-camera: Replace open-coded idr with a
 struct idr.

On Thu, May 10, 2018 at 04:31:07PM -0700, Eric Anholt wrote:
> @@ -258,32 +181,40 @@ get_msg_context(struct vchiq_mmal_instance *instance)
>  	if (!msg_context)
>  		return ERR_PTR(-ENOMEM);
>  
> -	msg_context->instance = instance;
> -	msg_context->handle =
> -		mmal_context_map_create_handle(&instance->context_map,
> -					       msg_context,
> -					       GFP_KERNEL);
> +	/* Create an ID that will be passed along with our message so
> +	 * that when we service the VCHI reply, we can look up what
> +	 * message is being replied to.
> +	 */
> +	spin_lock(&instance->context_map_lock);
> +	handle = idr_alloc(&instance->context_map, msg_context,
> +			   0, 0, GFP_KERNEL);
> +	spin_unlock(&instance->context_map_lock);
>  
> -	if (!msg_context->handle) {
> +	if (msg_context->handle < 0) {

This should probably be testing:

	if (handle < 0) {

>  		kfree(msg_context);
> -		return ERR_PTR(-ENOMEM);
> +		return ERR_PTR(handle);
>  	}
>  
> +	msg_context->instance = instance;
> +	msg_context->handle = handle;
> +
>  	return msg_context;
>  }
>