linux-kernel - [PATCH 3.13 045/103] USB: option: reduce interrupt-urb logging verbosity

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Message-Id: <1412112708-27356-46-git-send-email-kamal@canonical.com>
Date:	Tue, 30 Sep 2014 14:30:50 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Johan Hovold <johan@...nel.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 045/103] USB: option: reduce interrupt-urb logging verbosity

3.13.11.8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit f0e4cba2534cd88476dff920727c81350130f3c5 upstream.

Do not log normal interrupt-urb shutdowns as errors.

The option driver has always been logging any nonzero interrupt-urb
status as an error, including when the urb is killed during normal
operation.

Commit 9096f1fbba91 ("USB: usb_wwan: fix potential NULL-deref at
resume") moved the interrupt urb submission from port probe and release
to open and close, thus potentially increasing the number of these
false-positive error messages dramatically.

Reported-by: Ed Butler <ressy66@...ics.net>
Tested-by: Ed Butler <ressy66@...ics.net>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/usb/serial/option.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 04d3eef..2ab1c8c 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -1917,6 +1917,8 @@ static void option_instat_callback(struct urb *urb)
 			dev_dbg(dev, "%s: type %x req %x\n", __func__,
 				req_pkt->bRequestType, req_pkt->bRequest);
 		}
+	} else if (status == -ENOENT || status == -ESHUTDOWN) {
+		dev_dbg(dev, "%s: urb stopped: %d\n", __func__, status);
 	} else
 		dev_err(dev, "%s: error %d\n", __func__, status);
 
-- 
1.9.1

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