tree b6dd0846659aa417ebe2b4035e1262d44fac7961
parent dae3ddba36f8c337fb59cef07d564da6fc9b7551
author Tobias Herzog <t-herzog@gmx.de> 1537647071 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1539094422 +0200

cdc-acm: correct counting of UART states in serial state notification

The usb standard ("Universal Serial Bus Class Definitions for Communication
Devices") distiguishes between "consistent signals" (DSR, DCD), and
"irregular signals" (break, ring, parity error, framing error, overrun).
The bits of "irregular signals" are set, if this error/event occurred on
the device side and are immeadeatly unset, if the serial state notification
was sent.
Like other drivers of real serial ports do, just the occurence of those
events should be counted in serial_icounter_struct (but no 1->0
transitions).

Signed-off-by: Tobias Herzog <t-herzog@gmx.de>
Acked-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>