linux-kernel - Re: [PATCH 2/2] driver core: firmware loader: kill FW_ACTION

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Date:	Mon, 27 May 2013 14:24:59 +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 2/2] driver core: firmware loader: kill FW_ACTION_NOHOTPLUG requests before suspend

At Mon, 27 May 2013 18:30:04 +0800,
Ming Lei wrote:
> 
> This patch kills the firmware loading requests of FW_ACTION_NOHOTPLUG
> before suspend to avoid blocking suspend because there is no timeout
> for these requests.
> 
> Cc: Takashi Iwai <tiwai@...e.de>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
> 
> This patch depends on Takashi Iwai's patch of "firmware: Avoid deadlock of
> usermodehelper lock at shutdown"

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


thanks,

Takashi

> 
>  drivers/base/firmware_class.c |   17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 64e7870..5690e72 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -128,6 +128,7 @@ struct firmware_buf {
>  	size_t size;
>  #ifdef CONFIG_FW_LOADER_USER_HELPER
>  	bool is_paged_buf;
> +	bool need_uevent;
>  	struct page **pages;
>  	int nr_pages;
>  	int page_array_size;
> @@ -873,6 +874,7 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
>  	}
>  
>  	if (uevent) {
> +		buf->need_uevent = true;
>  		dev_set_uevent_suppress(f_dev, false);
>  		dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
>  		if (timeout != MAX_SCHEDULE_TIMEOUT)
> @@ -1407,6 +1409,20 @@ static void __device_uncache_fw_images(void)
>  	spin_unlock(&fwc->name_lock);
>  }
>  
> +/* kill pending requests without uevent to avoid blocking suspend */
> +static void kill_requests_without_uevent(void)
> +{
> +	struct firmware_buf *buf;
> +	struct firmware_buf *next;
> +
> +	mutex_lock(&fw_lock);
> +	list_for_each_entry_safe(buf, next, &pending_fw_head, pending_list) {
> +		if (!buf->need_uevent)
> +			 fw_load_abort(buf);
> +	}
> +	mutex_unlock(&fw_lock);
> +}
> +
>  /**
>   * device_cache_fw_images - cache devices' firmware
>   *
> @@ -1486,6 +1502,7 @@ static int fw_pm_notify(struct notifier_block *notify_block,
>  	switch (mode) {
>  	case PM_HIBERNATION_PREPARE:
>  	case PM_SUSPEND_PREPARE:
> +		kill_requests_without_uevent();
>  		device_cache_fw_images();
>  		break;
>  
> -- 
> 1.7.9.5
> 
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