diff options
| author | Peter Hurley | 2014-09-02 23:39:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2014-09-09 01:22:42 +0200 |
| commit | db106df32d679db151b48a09543b03ee41cb2580 (patch) | |
| tree | bef38581727c0696e7aac02df61ceb9a8a093685 /drivers/tty/serial/sunhv.c | |
| parent | serial: core: Remove unsafe x_char optimization (diff) | |
| download | kernel-qcow2-linux-db106df32d679db151b48a09543b03ee41cb2580.tar.gz kernel-qcow2-linux-db106df32d679db151b48a09543b03ee41cb2580.tar.xz kernel-qcow2-linux-db106df32d679db151b48a09543b03ee41cb2580.zip | |
serial: Fix send_xchar() handlers
START_CHAR() & STOP_CHAR() can be disabled if set to '\0'
(__DISABLED_CHAR). UART drivers which define a send_xchar()
handler must not transmit __DISABLED_CHAR.
Document requirement.
Affected drivers:
sunsab
sunhv
cc: David S. Miller <davem@davemloft.net>
cc: <sparclinux@vger.kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sunhv.c')
| -rw-r--r-- | drivers/tty/serial/sunhv.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c index 20521db2189f..25d43ce8b318 100644 --- a/drivers/tty/serial/sunhv.c +++ b/drivers/tty/serial/sunhv.c @@ -268,6 +268,9 @@ static void sunhv_send_xchar(struct uart_port *port, char ch) unsigned long flags; int limit = 10000; + if (ch == __DISABLED_CHAR) + return; + spin_lock_irqsave(&port->lock, flags); while (limit-- > 0) { |