linux-kernel - Re: [PATCH v3 3/6] RapidIO: Add Port-Write handling for EM

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Message-Id: <20100412204949.862b3fab.akpm@linux-foundation.org>
Date:	Mon, 12 Apr 2010 20:49:49 -0400
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexandre Bounine <abounine@...dra.com>
Cc:	torvalds@...ux-foundation.org, mporter@...nel.crashing.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	thomas.moll@...go.com
Subject: Re: [PATCH v3 3/6] RapidIO: Add Port-Write handling for EM

On Tue, 6 Apr 2010 17:22:38 -0400 Alexandre Bounine <abounine@...dra.com> wrote:

> 
> From: Alexandre Bounine <alexandre.bounine@....com>
> 
> Add RapidIO Port-Write message handling in the context
> of Error Management Extensions Specification Rev.1.3.
>
> ...
>
> +static struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
> +{
> +	struct list_head *n;
> +	struct rio_dev *rdev;
> +
> +	WARN_ON(in_interrupt());

The check should be unneeded - lockdep will warn about this.

> +	spin_lock(&rio_global_list_lock);
> +	n = from ? from->global_list.next : rio_devices.next;
> +
> +	while (n && (n != &rio_devices)) {
> +		rdev = rio_dev_g(n);
> +		if (rdev->comp_tag == comp_tag)
> +			goto exit;
> +		n = n->next;
> +	}
> +	rdev = NULL;
> +exit:
> +	spin_unlock(&rio_global_list_lock);
> +	return rdev;
> +}
> +

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