[PATCH v2] serial: st-asc: don't get/put GPIOs in atomic context

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

Since commit 1f2bcb8c8ccd ("gpio: protect the descriptor label with
SRCU") gpiod_set_consumer_name() calls synchronize_srcu() which led to
a "sleeping in atomic context" smatch warning.

This function (along with gpiod_get/put() and all other GPIO APIs apart
from gpiod_get/set_value() and gpiod_direction_input/output()) should
have never been called with a spinlock taken. We're only fixing this now
as GPIOLIB has been rebuilt to use SRCU for access serialization which
uncovered this problem.

Move the calls to gpiod_get/put() outside the spinlock critical section.

Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Closes: https://lore.kernel.org/linux-gpio/deee1438-efc1-47c4-8d80-0ab2cf01d60a@moroto.mountain/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
v1 -> v2:
- initialize the 'manual_rts' variable to false as we don't always get to
  the place where it's set

 drivers/tty/serial/st-asc.c | 40 ++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index bbb5595d7e24..f184de6af313 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -466,6 +466,7 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
 {
 	struct asc_port *ascport = to_asc_port(port);
 	struct gpio_desc *gpiod;
+	bool manual_rts = false;
 	unsigned int baud;
 	u32 ctrl_val;
 	tcflag_t cflag;
@@ -517,26 +518,12 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
 		ctrl_val |= ASC_CTL_CTSENABLE;
 
 		/* If flow-control selected, stop handling RTS manually */
-		if (ascport->rts) {
-			devm_gpiod_put(port->dev, ascport->rts);
-			ascport->rts = NULL;
-
-			pinctrl_select_state(ascport->pinctrl,
-					     ascport->states[DEFAULT]);
-		}
+		if (ascport->rts)
+			manual_rts = false;
 	} else {
 		/* If flow-control disabled, it's safe to handle RTS manually */
-		if (!ascport->rts && ascport->states[NO_HW_FLOWCTRL]) {
-			pinctrl_select_state(ascport->pinctrl,
-					     ascport->states[NO_HW_FLOWCTRL]);
-
-			gpiod = devm_gpiod_get(port->dev, "rts", GPIOD_OUT_LOW);
-			if (!IS_ERR(gpiod)) {
-				gpiod_set_consumer_name(gpiod,
-						port->dev->of_node->name);
-				ascport->rts = gpiod;
-			}
-		}
+		if (!ascport->rts && ascport->states[NO_HW_FLOWCTRL])
+			manual_rts = true;
 	}
 
 	if ((baud < 19200) && !ascport->force_m1) {
@@ -595,6 +582,23 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
 	asc_out(port, ASC_CTL, (ctrl_val | ASC_CTL_RUN));
 
 	uart_port_unlock_irqrestore(port, flags);
+
+	if (manual_rts) {
+		pinctrl_select_state(ascport->pinctrl,
+				     ascport->states[NO_HW_FLOWCTRL]);
+
+		gpiod = devm_gpiod_get(port->dev, "rts", GPIOD_OUT_LOW);
+		if (!IS_ERR(gpiod)) {
+			gpiod_set_consumer_name(gpiod,
+						port->dev->of_node->name);
+			ascport->rts = gpiod;
+		} else {
+			devm_gpiod_put(port->dev, ascport->rts);
+			ascport->rts = NULL;
+			pinctrl_select_state(ascport->pinctrl,
+					     ascport->states[DEFAULT]);
+		}
+	}
 }
 
 static const char *asc_type(struct uart_port *port)
-- 
2.40.1