Date: Mon, 12 Apr 2010 20:49:49 -0400
From: Andrew Morton <akpm@linux-foundation.org>
To: Alexandre Bounine <abounine@tundra.com>
Cc: torvalds@linux-foundation.org, mporter@kernel.crashing.org,
       linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
       thomas.moll@sysgo.com
Subject: Re: [PATCH v3 3/6] RapidIO: Add Port-Write handling for EM
Message-Id: <20100412204949.862b3fab.akpm@linux-foundation.org>
In-Reply-To: <20100406212238.GC26292@amak.tundra.com>
References: <20100406212238.GC26292@amak.tundra.com>
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On Tue, 6 Apr 2010 17:22:38 -0400 Alexandre Bounine <abounine@tundra.com> wrote:

> 
> From: Alexandre Bounine <alexandre.bounine@idt.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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