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

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Date:	Tue, 23 Sep 2014 19:12:40 +0000 (UTC)
From:	Scot Doyle <lkml14@...tdoyle.com>
To:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>
cc:	Daniel Mack <daniel@...aq.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] usb: core: downgrade log severity to info when descriptor
 unavailable

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);
 		dev->string_langid = -1;
 		return -EPIPE;
 	}
-- 
2.1.0

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