linux-kernel - Re: [PATCH 2/3] cxgb4: make configuration load use request_firmware

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Message-Id: <D46B557B-AF4A-4E60-8D83-6181D406C64F@chelsio.com>
Date:	Tue, 24 Jun 2014 15:54:44 -0700
From:	Casey Leedom <leedom@...lsio.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	tiwai@...e.de, chunkeey@...glemail.com, cocci@...teme.lip6.fr,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, "Luis R. Rodriguez" <mcgrof@...e.com>,
	Philip Oswald <poswald@...e.com>,
	Santosh Rastapur <santosh@...lsio.com>,
	Jeffrey Cheung <jcheung@...e.com>,
	David Chang <dchang@...e.com>,
	Hariprasad Shenai <hariprasad@...lsio.com>
Subject: Re: [PATCH 2/3] cxgb4: make configuration load use request_firmware_direct()

[[ Hopefully this makes it through to the kernel.org lists -- I’m using the Mac OS/X Mailer and it’s not clear how to force it not to use HTML format. -- Casey ]]

  So does request_firmware_direct() only fail if the requested file is not present on the file system or does it fail in other cases as well?

  If it’s the former, then the change to cxgb4 is fine.

  But if it’s the latter, then it’s definitely not okay.  While the driver _can_ continue running without the local on-disk Firmware Configuration File, that file can be used to significantly change the behavior and capabilities of the adapter and is user-customizable.  If a user makes changes to the local on-disk Firmware Configuration File and these are randomly silently ignored this will lead to highly annoying support issues.

Casey


On Jun 24, 2014, at 3:39 PM, Luis R. Rodriguez <mcgrof@...not-panic.com> wrote:

> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> cxgb4 uses request_firmware() 3 times, one for firmware, one for
> optional configuration files and another for ethtools flash. Since the
> configuration update is optional on devices that don't have a
> configuration file update it means we'd wait unnecessarily for the
> extra udev timeout, which by default is 60 seconds. Avoid this
> extra delay.
> 
> This was found with the following SmPL patch.
> 
> @ firmware_not_critical @
> expression cf;
> expression config_file;
> expression dev;
> int ret;
> identifier l;
> statement S;
> @@
> 
> -	ret = request_firmware(&cf, config_file, dev);
> +	ret = request_firmware_direct(&cf, config_file, dev);
> 	if (ret < 0) {
> 		... when != goto l;
> 		    when != return ret;
> 		    when any
> 	} else {
> 		...
> 		release_firmware(cf);
> 		...
> 	}
> 
> Cc: Philip Oswald <poswald@...e.com>
> Cc: Santosh Rastapur <santosh@...lsio.com>
> Cc: Jeffrey Cheung <jcheung@...e.com>
> Cc: David Chang <dchang@...e.com>
> Cc: Casey Leedom <leedom@...lsio.com>
> Cc: Hariprasad Shenai <hariprasad@...lsio.com>
> Cc: Takashi Iwai <tiwai@...e.de>
> Cc: cocci@...teme.lip6.fr
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
> ---
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> index 02a0ebf..bd57177 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> @@ -4999,7 +4999,7 @@ static int adap_init0_config(struct adapter *adapter, int reset)
>  		goto bye;
>  	}
> 
> -	ret = request_firmware(&cf, fw_config_file, adapter->pdev_dev);
> +	ret = request_firmware_direct(&cf, fw_config_file, adapter->pdev_dev);
>  	if (ret < 0) {
>  		config_name = "On FLASH";
>  		mtype = FW_MEMTYPE_CF_FLASH;
> -- 
> 2.0.0
> 

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