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Subject[PATCH AUTOSEL for 4.14 002/100] serdev: fix receive_buf return value when no callback
From: Johan Hovold <>

[ 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 <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Sasha Levin <>
include/linux/serdev.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index e69402d4a8ae..d609e6dc5bad 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -184,7 +184,7 @@ static inline int serdev_controller_receive_buf(struct serdev_controller *ctrl,
struct serdev_device *serdev = ctrl->serdev;

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

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