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Date: Sat, 9 Apr 2016 17:53:21 -0700
From: Peter Hurley <peter@...leysoftware.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org,
Grant Edwards <grant.b.edwards@...il.com>,
Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 2/8] tty: Replace ASYNC_CTS_FLOW bit and update atomically
Replace ASYNC_CTS_FLOW bit in the tty_port::flags field with
TTY_PORT_CTS_FLOW bit in the tty_port::iflags field. Add
tty_port_set_cts_flow() helper to abstract the atomic bit ops.
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
drivers/char/pcmcia/synclink_cs.c | 5 +----
drivers/tty/amiserial.c | 6 ++----
drivers/tty/cyclades.c | 10 ++++------
drivers/tty/isicom.c | 6 ++----
drivers/tty/mxser.c | 4 +---
drivers/tty/synclink.c | 7 ++-----
drivers/tty/synclink_gt.c | 5 +----
drivers/tty/synclinkmp.c | 5 +----
include/linux/tty.h | 12 ++++++++++--
net/irda/ircomm/ircomm_tty_ioctl.c | 3 +--
10 files changed, 25 insertions(+), 38 deletions(-)
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index bcae5bb..bdf41ac 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -1466,10 +1466,7 @@ static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
- if (cflag & CRTSCTS)
- info->port.flags |= ASYNC_CTS_FLOW;
- else
- info->port.flags &= ~ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index e68208e..92717b0 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -727,11 +727,9 @@ static void change_speed(struct tty_struct *tty, struct serial_state *info,
info->IER &= ~UART_IER_MSI;
if (port->flags & ASYNC_HARDPPS_CD)
info->IER |= UART_IER_MSI;
- if (cflag & CRTSCTS) {
- port->flags |= ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(port, cflag & CRTSCTS);
+ if (cflag & CRTSCTS)
info->IER |= UART_IER_MSI;
- } else
- port->flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
port->flags &= ~ASYNC_CHECK_CD;
else {
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
index d67e542..1a12776 100644
--- a/drivers/tty/cyclades.c
+++ b/drivers/tty/cyclades.c
@@ -2083,13 +2083,11 @@ static void cy_set_line_char(struct cyclades_port *info, struct tty_struct *tty)
info->cor1 |= CyPARITY_NONE;
/* CTS flow control flag */
- if (cflag & CRTSCTS) {
- info->port.flags |= ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
+ if (cflag & CRTSCTS)
info->cor2 |= CyCtsAE;
- } else {
- info->port.flags &= ~ASYNC_CTS_FLOW;
+ else
info->cor2 &= ~CyCtsAE;
- }
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
else
@@ -2234,7 +2232,7 @@ static void cy_set_line_char(struct cyclades_port *info, struct tty_struct *tty)
}
/* As the HW flow control is done in firmware, the driver
doesn't need to care about it */
- info->port.flags &= ~ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(&info->port, 0);
/* XON/XOFF/XANY flow control flags */
sw_flow = 0;
diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
index 8bf6763..c5f06b5 100644
--- a/drivers/tty/isicom.c
+++ b/drivers/tty/isicom.c
@@ -765,11 +765,9 @@ static void isicom_config_port(struct tty_struct *tty)
/* flow control settings ...*/
flow_ctrl = 0;
- port->port.flags &= ~ASYNC_CTS_FLOW;
- if (C_CRTSCTS(tty)) {
- port->port.flags |= ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(&port->port, C_CRTSCTS(tty));
+ if (C_CRTSCTS(tty))
flow_ctrl |= ISICOM_CTSRTS;
- }
if (I_IXON(tty))
flow_ctrl |= ISICOM_RESPOND_XONXOFF;
if (I_IXOFF(tty))
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index f23c2a1..8f3fdad 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -711,8 +711,8 @@ static int mxser_change_speed(struct tty_struct *tty,
/* CTS flow control flag and modem status interrupts */
info->IER &= ~UART_IER_MSI;
info->MCR &= ~UART_MCR_AFE;
+ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
if (cflag & CRTSCTS) {
- info->port.flags |= ASYNC_CTS_FLOW;
info->IER |= UART_IER_MSI;
if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
info->MCR |= UART_MCR_AFE;
@@ -744,8 +744,6 @@ static int mxser_change_speed(struct tty_struct *tty,
}
}
}
- } else {
- info->port.flags &= ~ASYNC_CTS_FLOW;
}
outb(info->MCR, info->ioaddr + UART_MCR);
if (cflag & CLOCAL) {
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 3768e5c..0e42901 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -1966,11 +1966,8 @@ static void mgsl_change_params(struct mgsl_struct *info)
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
- if (cflag & CRTSCTS)
- info->port.flags |= ASYNC_CTS_FLOW;
- else
- info->port.flags &= ~ASYNC_CTS_FLOW;
-
+ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
+
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
else
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index ceeaeb7..5da69d3 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -2576,10 +2576,7 @@ static void change_params(struct slgt_info *info)
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
- if (cflag & CRTSCTS)
- info->port.flags |= ASYNC_CTS_FLOW;
- else
- info->port.flags &= ~ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index b0cce4b..7a21491 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -2813,10 +2813,7 @@ static void change_params(SLMP_INFO *info)
}
info->timeout += HZ/50; /* Add .02 seconds of slop */
- if (cflag & CRTSCTS)
- info->port.flags |= ASYNC_CTS_FLOW;
- else
- info->port.flags &= ~ASYNC_CTS_FLOW;
+ tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
if (cflag & CLOCAL)
info->port.flags &= ~ASYNC_CHECK_CD;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 4e0dbda0..989d755b 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -255,7 +255,6 @@ struct tty_port {
#define TTY_PORT_CTS_FLOW 3 /* h/w flow control enabled */
#define TTY_PORT_CHECK_CD 4 /* carrier detect enabled */
-
/*
* Where all of the state associated with a tty is kept while the tty
* is open. Since the termios state should be kept even if the tty
@@ -561,9 +560,18 @@ static inline struct tty_port *tty_port_get(struct tty_port *port)
/* If the cts flow control is enabled, return true. */
static inline bool tty_port_cts_enabled(struct tty_port *port)
{
- return port->flags & ASYNC_CTS_FLOW;
+ return test_bit(TTY_PORT_CTS_FLOW, &port->iflags);
}
+static inline void tty_port_set_cts_flow(struct tty_port *port, bool val)
+{
+ if (val)
+ set_bit(TTY_PORT_CTS_FLOW, &port->iflags);
+ else
+ clear_bit(TTY_PORT_CTS_FLOW, &port->iflags);
+}
+
+
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);
diff --git a/net/irda/ircomm/ircomm_tty_ioctl.c b/net/irda/ircomm/ircomm_tty_ioctl.c
index 8d8fd28..1220973 100644
--- a/net/irda/ircomm/ircomm_tty_ioctl.c
+++ b/net/irda/ircomm/ircomm_tty_ioctl.c
@@ -86,15 +86,14 @@ static void ircomm_tty_change_speed(struct ircomm_tty_cb *self,
ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
/* CTS flow control flag and modem status interrupts */
+ tty_port_set_cts_flow(&self->port, cflag & CRTSCTS);
if (cflag & CRTSCTS) {
- self->port.flags |= ASYNC_CTS_FLOW;
self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
/* This got me. Bummer. Jean II */
if (self->service_type == IRCOMM_3_WIRE_RAW)
net_warn_ratelimited("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n",
__func__);
} else {
- self->port.flags &= ~ASYNC_CTS_FLOW;
self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
}
if (cflag & CLOCAL)
--
2.8.1
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