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| author |   Meng Li <Meng.Li@windriver.com> | 2022-09-21 11:20:20 +0800 |
|---|---|---|
| committer |   Bartosz Golaszewski <brgl@bgdev.pl> | 2022-09-21 09:32:11 +0200 |
| commit | 69bef19d6b9700e96285f4b4e28691cda3dcd0d1 (patch) | |
| tree | 9a2c14b65f62b1d265239e0b196b40ec50fc268f /drivers/gpio | |
| parent | gpio: tqmx86: fix uninitialized variable girq (diff) | |
| download | linux-dev-69bef19d6b9700e96285f4b4e28691cda3dcd0d1.tar.xz linux-dev-69bef19d6b9700e96285f4b4e28691cda3dcd0d1.zip | |
gpiolib: cdev: Set lineevent_state::irq after IRQ register successfully
When running gpio test on nxp-ls1028 platform with below command
gpiomon --num-events=3 --rising-edge gpiochip1 25
There will be a warning trace as below:
Call trace:
free_irq+0x204/0x360
lineevent_free+0x64/0x70
gpio_ioctl+0x598/0x6a0
__arm64_sys_ioctl+0xb4/0x100
invoke_syscall+0x5c/0x130
......
el0t_64_sync+0x1a0/0x1a4
The reason of this issue is that calling request_threaded_irq()
function failed, and then lineevent_free() is invoked to release
the resource. Since the lineevent_state::irq was already set, so
the subsequent invocation of free_irq() would trigger the above
warning call trace. To fix this issue, set the lineevent_state::irq
after the IRQ register successfully.
Fixes: 468242724143 ("gpiolib: cdev: refactor lineevent cleanup into lineevent_free")
Cc: stable@vger.kernel.org
Signed-off-by: Meng Li <Meng.Li@windriver.com>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-cdev.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index f8041d4898d1..92f185575e94 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -1986,7 +1986,6 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) ret = -ENODEV; goto out_free_le; } - le->irq = irq; if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? @@ -2000,7 +1999,7 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) init_waitqueue_head(&le->wait); /* Request a thread to read the events */ - ret = request_threaded_irq(le->irq, + ret = request_threaded_irq(irq, lineevent_irq_handler, lineevent_irq_thread, irqflags, @@ -2009,6 +2008,8 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) if (ret) goto out_free_le; + le->irq = irq; + fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); if (fd < 0) { ret = fd; |