serial: st-asc: don't get/put GPIOs in atomic context

From: Bartosz Golaszewski <[email protected]>

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 <[email protected]>

Closes https://lore.kernel.org/linux-gpio/[email protected]/ open here

Signed-off-by Bartosz Golaszewski <[email protected]>

---
v2 -> v3:
- we only need to change the GPIO configuration for RTS in certain situations so use a separate variable for storing that information; if we don't then we may end up putting the descriptor when setting a different option
- I dropped Linus tag as the code change significantly

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, 24 insertions(+), 16 deletions(-)

drivers/tty/serial/st-asc.c +17 -16

index bbb5595d7e24..a23e59551848 100644
@@ -465,6 +465,7 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
 			    const struct ktermios *old)
 {
 	struct asc_port *ascport = to_asc_port(port);
+	bool manual_rts, toggle_rts = false;
 	struct gpio_desc *gpiod;
 	unsigned int baud;
 	u32 ctrl_val;

@@ -518,25 +519,13 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
 
 		/* 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]);
+			toggle_rts = true;
+			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 = toggle_rts = true;
 	}
 
 	if ((baud < 19200) && !ascport->force_m1) {

@@ -595,6 +584,25 @@ 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 (toggle_rts) {
+		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;
+			}