linux-kernel - Re: [PATCH 1/3] misc: Add crossbar driver

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Date:	Thu, 18 Jul 2013 09:55:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Sricharan R <r.sricharan@...com>
Cc:	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, tony@...mide.com,
	linux@....linux.org.uk, nm@...com, rnayak@...com, balbi@...com
Subject: Re: [PATCH 1/3] misc: Add crossbar driver

On Thu, 2013-07-18 at 22:13 +0530, Sricharan R wrote:
> Some socs have a large number of interrupts/dma requests to service
> the needs of its many peripherals and subsystems. All of the
> requests lines from the subsystems are not needed at the same
> time, so they have to be muxed to the controllers appropriately.
> In such places a interrupt/dma controllers are preceded by an
> IRQ/DMA CROSSBAR that provides flexibility in muxing the device
> requests to the controller inputs.
[]
> diff --git a/drivers/misc/crossbar.c b/drivers/misc/crossbar.c
[]
> +int crossbar_unmap(struct device_node *cbdev_node, unsigned index)
[]
> +	list_for_each_entry(cbdev, &cb_devlist, node) {
> +		if (strcmp(cbdev->name, tmp.cb_name))
> +			continue;
[]
> +				dev_warn(cbdev->dev,
> +					 "unmapped int_no %x mapped to cb %x\n",
> +					 tmp.int_no, tmp.cb_no);
> +				return 0;
[]
> +	dev_warn(cbdev->dev, "%s cb entry %d not found\n",
> +		 __func__, tmp.cb_no);
> +	return -ENOENT;

Why does this function always emit a dev_warn
before return?  Maybe the first should be dev_info?


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