[PATCH] Serial: Adjust serial locking
This patch changes the way serial ports are locked when getting modem
status. This change is necessary because we will need to atomically
read the modem status and take action depending on the CTS status.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index 85abd8a..1c9f716 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -604,7 +604,7 @@
/*
* Get Modem Control bits (only the input ones, the core will
* or that with a cached value of the control ones)
- * The port lock is not held.
+ * The port lock is held and interrupts are disabled.
*/
static unsigned int pmz_get_mctrl(struct uart_port *port)
{
@@ -615,7 +615,7 @@
if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
return 0;
- status = pmz_peek_status(to_pmz(port));
+ status = read_zsreg(uap, R0);
ret = 0;
if (status & DCD)
