linux-kernel - Re: [PATCH v2] usb: core: downgrade log severity to info when descriptor unavailable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140924051851.GA6519@kroah.com>
Date:	Tue, 23 Sep 2014 22:18:51 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Scot Doyle <lkml14@...tdoyle.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Daniel Mack <daniel@...aq.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: core: downgrade log severity to info when
 descriptor unavailable

On Tue, Sep 23, 2014 at 07:12:40PM +0000, Scot Doyle wrote:
> According to commit 0cce2eda19923e5e5ccc8b042dec5af87b3ffad0
>     USB: fix LANGID=0 regression
> 
> usb devices are not required to report string descriptors. Since they are
> optional, log an info message instead of an error message.
> 
> Signed-off-by: Scot Doyle <lkml14@...tdoyle.com>
> ---
>  drivers/usb/core/message.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
> index 0c8a7fc..da2f1f2 100644
> --- a/drivers/usb/core/message.c
> +++ b/drivers/usb/core/message.c
> @@ -780,8 +780,12 @@ static int usb_get_langid(struct usb_device *dev, unsigned char *tbuf)
>  	 * deal with strings at all. Set string_langid to -1 in order to
>  	 * prevent any string to be retrieved from the device */
>  	if (err < 0) {
> -		dev_err(&dev->dev, "string descriptor 0 read error: %d\n",
> -					err);
> +		if (err == -EPIPE)
> +			dev_info(&dev->dev,
> +				 "string descriptor 0 read error: -EPIPE\n");
> +		else
> +			dev_err(&dev->dev,
> +				"string descriptor 0 read error: %d\n", err);

What real difference does this patch make?  What would a user do with
-EPIPE?

And USB devices _are_ required to provide a string descriptor if they
provide a string id, so your changelog body doesn't make much sense.  I
suggest rewriting it to say they aren't required to provide a string
descriptor for string "0".

But even then, I don't understand the goal of this patch.

thanks,

greg k-h
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/