linux-kernel - Re: [PATCH 1/2] driver core: firmware loader: don't cache FW_ACTION

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Date:	Mon, 27 May 2013 14:24:13 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] driver core: firmware loader: don't cache FW_ACTION_NOHOTPLUG firmware

At Mon, 27 May 2013 18:30:03 +0800,
Ming Lei wrote:
> 
> Generally there are only two drivers which don't need uevent to
> handle firmware loading, so don't cache these firmwares during
> suspend for these drivers since doing that may block firmware
> loading forever.
> 
> Both the two drivers are involved in private firmware images, so
> they don't hit in direct loading too.
> 
> Cc: Takashi Iwai <tiwai@...e.de>

Reviewed-by: Takashi Iwai <tiwai@...e.de>


> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
>  drivers/base/firmware_class.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index e650c25..64e7870 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -993,7 +993,8 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
>  	return 1; /* need to load */
>  }
>  
> -static int assign_firmware_buf(struct firmware *fw, struct device *device)
> +static int assign_firmware_buf(struct firmware *fw, struct device *device,
> +				bool skip_cache)
>  {
>  	struct firmware_buf *buf = fw->priv;
>  
> @@ -1010,7 +1011,7 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device)
>  	 * device may has been deleted already, but the problem
>  	 * should be fixed in devres or driver core.
>  	 */
> -	if (device)
> +	if (device && !skip_cache)
>  		fw_add_devm_name(device, buf->fw_id);
>  
>  	/*
> @@ -1066,8 +1067,10 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
>  	if (!fw_get_filesystem_firmware(device, fw->priv))
>  		ret = fw_load_from_user_helper(fw, name, device,
>  					       uevent, nowait, timeout);
> +
> +	/* don't cache firmware handled without uevent */
>  	if (!ret)
> -		ret = assign_firmware_buf(fw, device);
> +		ret = assign_firmware_buf(fw, device, !uevent);
>  
>  	usermodehelper_read_unlock();
>  
> -- 
> 1.7.9.5
> 
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