From 25d071b3f6dbe4c4b9c9d0df76fbe9292310e799 Mon Sep 17 00:00:00 2001 From: Jia-Ju Bai Date: Thu, 19 Dec 2019 21:14:59 +0800 Subject: [PATCH] gpio: gpio-grgpio: fix possible sleep-in-atomic-context bugs in grgpio_remove() drivers/gpio/gpiolib-sysfs.c, 796: mutex_lock in gpiochip_sysfs_unregister drivers/gpio/gpiolib.c, 1455: gpiochip_sysfs_unregister in gpiochip_remove drivers/gpio/gpio-grgpio.c, 460: gpiochip_remove in grgpio_remove drivers/gpio/gpio-grgpio.c, 449: _raw_spin_lock_irqsave in grgpio_remove kernel/irq/irqdomain.c, 243: mutex_lock in irq_domain_remove drivers/gpio/gpio-grgpio.c, 463: irq_domain_remove in grgpio_remove drivers/gpio/gpio-grgpio.c, 449: _raw_spin_lock_irqsave in grgpio_remove mutex_lock() can sleep at runtime. To fix these bugs, the lock is dropped in grgpio_remove(), because there is no need for locking in remove() callbacks. These bugs are found by a static analysis tool STCheck written by myself. Signed-off-by: Jia-Ju Bai Link: https://lore.kernel.org/r/20191219131459.18640-1-baijiaju1990@gmail.com Signed-off-by: Linus Walleij --- drivers/gpio/gpio-grgpio.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c index 08234e6..a49f071 100644 --- a/drivers/gpio/gpio-grgpio.c +++ b/drivers/gpio/gpio-grgpio.c @@ -437,8 +437,6 @@ static int grgpio_remove(struct platform_device *ofdev) int i; int ret = 0; - spin_lock_irqsave(&priv->gc.bgpio_lock, flags); - if (priv->domain) { for (i = 0; i < GRGPIO_MAX_NGPIO; i++) { if (priv->uirqs[i].refcnt != 0) { @@ -454,8 +452,6 @@ static int grgpio_remove(struct platform_device *ofdev) irq_domain_remove(priv->domain); out: - spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags); - return ret; } -- 2.7.4