[PATCH 8/8] pwm: img: Unregister PWM chip before disabling runtime PM and clocks

[Lee Jones <lee@kernel.org>]

img_pwm_remove() disables runtime PM and gates the peripheral clocks via
img_pwm_runtime_suspend() before calling pwmchip_remove().  While the
PWM chip is still registered, a consumer can call img_pwm_apply(), where
pm_runtime_resume_and_get() returns -EACCES or succeeds without
re-enabling clocks, leading to unclocked register access.

Call pwmchip_remove() before disabling runtime PM and suspending the
device.

Fixes: 277bb6a29e00 ("pwm: Imagination Technologies PWM DAC driver")
Closes: https://sashiko.dev/#/bug/linux-b06bab8d-dbf2-4ba2-9f5d-c5e141076abd
Cc: stable@vger.kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
---
 drivers/pwm/pwm-img.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
index 91e0b19f0c08..b6e090674c07 100644
--- a/drivers/pwm/pwm-img.c
+++ b/drivers/pwm/pwm-img.c
@@ -338,11 +338,11 @@ static void img_pwm_remove(struct platform_device *pdev)
 {
 	struct pwm_chip *chip = platform_get_drvdata(pdev);
 
-	pm_runtime_disable(&pdev->dev);
-	if (!pm_runtime_status_suspended(&pdev->dev))
-		img_pwm_runtime_suspend(&pdev->dev);
-
 	pwmchip_remove(chip);
+
+	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		img_pwm_runtime_suspend(&pdev->dev);
 }
 
 #ifdef CONFIG_PM_SLEEP
Cc: Naidu Tellapati <naidu.tellapati@gmail.com>
-- 
2.56.0.398.g882cbad275-goog