Thread (22 messages) 22 messages, 4 authors, 2024-08-27
STALE641d LANDED

[PATCH 15/17] Input: spear-keyboard - use guard notation when acquiring mutex

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2024-08-25 05:16:59
Also in: imx, linux-input, linux-tegra, lkml
Subsystem: input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers: Dmitry Torokhov, Linus Torvalds

This makes the code more compact and error handling more robust
by ensuring that mutexes are released in all code paths when control
leaves critical section.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/spear-keyboard.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/input/keyboard/spear-keyboard.c b/drivers/input/keyboard/spear-keyboard.c
index 1df4feb8ba01..2d3f656e59dc 100644
--- a/drivers/input/keyboard/spear-keyboard.c
+++ b/drivers/input/keyboard/spear-keyboard.c
@@ -274,7 +274,7 @@ static int spear_kbd_suspend(struct device *dev)
 	struct input_dev *input_dev = kbd->input;
 	unsigned int rate = 0, mode_ctl_reg, val;
 
-	mutex_lock(&input_dev->mutex);
+	guard(mutex)(&input_dev->mutex);
 
 	/* explicitly enable clock as we may program device */
 	clk_enable(kbd->clk);
@@ -315,8 +315,6 @@ static int spear_kbd_suspend(struct device *dev)
 	/* restore previous clk state */
 	clk_disable(kbd->clk);
 
-	mutex_unlock(&input_dev->mutex);
-
 	return 0;
 }
 
@@ -326,7 +324,7 @@ static int spear_kbd_resume(struct device *dev)
 	struct spear_kbd *kbd = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = kbd->input;
 
-	mutex_lock(&input_dev->mutex);
+	guard(mutex)(&input_dev->mutex);
 
 	if (device_may_wakeup(&pdev->dev)) {
 		if (kbd->irq_wake_enabled) {
@@ -342,8 +340,6 @@ static int spear_kbd_resume(struct device *dev)
 	if (input_device_enabled(input_dev))
 		writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG);
 
-	mutex_unlock(&input_dev->mutex);
-
 	return 0;
 }
 
-- 
2.46.0.295.g3b9ea8a38a-goog

Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help