linux-kernel - Re: [RFC PATCH 06/13] driver core: firmware loader: always let firmware

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Date:	Wed, 25 Jul 2012 00:55:27 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Ming Lei <ming.lei@...onical.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Borislav Petkov <borislav.petkov@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 06/13] driver core: firmware loader: always let firmware_buf
 own the pages buffer

Mostly trivia.

On 7/24/2012 10:00 AM, Ming Lei wrote:
> +
> +static int fw_lookup_and_alloate_buf(const char *fw_name,

allocate?

> +		struct firmware_cache *fwc,
> +		struct firmware_buf **buf)
> +{
> +	struct firmware_buf *tmp;
> +
> +	spin_lock(&fwc->lock);
> +	list_for_each_entry(tmp, &fwc->head, list)
> +		if (!strcmp(tmp->fw_id, fw_name)) {
> +			kref_get(&tmp->ref);
> +			spin_unlock(&fwc->lock);
> +			*buf = tmp;
> +			return 1;
> +		}
> +
> +	tmp = __allocate_fw_buf(fw_name, fwc);
> +	if (tmp)
> +		list_add(&tmp->list, &fwc->head);
> +	spin_unlock(&fwc->lock);
> +
> +	*buf = tmp;
> +
> +	return tmp ? 0 : -1;

-ENOMEM instead of -1?

> +
> +static void fw_cache_init(void)

__init?

> +{
> +	spin_lock_init(&fw_cache.lock);
> +	INIT_LIST_HEAD(&fw_cache.head);
> +}
> +
[...]
> uevent, nowait);
>  
> -/* transfer the ownership of pages to firmware */
> -static void fw_set_page_data(struct firmware_buf *buf)
> -{
> -	struct firmware *fw = buf->fw;
> +	if (IS_ERR(fw_priv) || ret == -1) {
> +		kfree(firmware);
> +		*firmware_p = NULL;
> +		return ERR_PTR(-ENOMEM);

This would have to check for < 0 and return ERR_PTR(ret) instead.

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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