AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

serial: Fix send_xchar() handlers

Browse Source 
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>
This commit is contained in:
Peter Hurley 2014-09-02 17:39:15 -04:00 committed by Greg Kroah-Hartman
parent fba594a848
commit db106df32d
3 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/serial/driver
View File

@ -140,6 +140,8 @@ hardware.
will append the character to the circular buffer and then call
start_tx() / stop_tx() to flush the data out.
Do not transmit if ch == '\0' (__DISABLED_CHAR).
Locking: none.
Interrupts: caller dependent.

3
drivers/tty/serial/sunhv.c
View File

@ -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) {

3
drivers/tty/serial/sunsab.c
View File

@ -468,6 +468,9 @@ static void sunsab_send_xchar(struct uart_port *port, char ch)
struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
unsigned long flags;
if (ch == __DISABLED_CHAR)
return;
spin_lock_irqsave(&up->port.lock, flags);
sunsab_tec_wait(up);