linux-kernel - [PATCH 4.14 060/159] serdev: fix receive

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Message-Id: <20180223170750.850913741@linuxfoundation.org>
Date:   Fri, 23 Feb 2018 19:26:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 060/159] serdev: fix receive_buf return value when no callback

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

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

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

[ Upstream commit fd00cf81a9a84776ba58e56bd042c726dcf75cf3 ]

The receive_buf callback is supposed to return the number of bytes
processed and should specifically not return a negative errno.

Due to missing sanity checks in the serdev tty-port controller, a driver
not providing a receive_buf callback could cause the flush_to_ldisc()
worker to spin in a tight loop when the tty buffer pointers are
incremented with -EINVAL (-22).

The missing sanity checks have now been added to the tty-port
controller, but let's fix up the serdev-controller helper as well.

Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/serdev.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -184,7 +184,7 @@ static inline int serdev_controller_rece
 	struct serdev_device *serdev = ctrl->serdev;

 	if (!serdev || !serdev->ops->receive_buf)
-		return -EINVAL;
+		return 0;

 	return serdev->ops->receive_buf(serdev, data, count);
 }