| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.2 66/94] HID: cp2112: prevent sleeping function called from invalid context | Date | Sun, 8 Sep 2019 13:42:02 +0100 |
| |
[ Upstream commit 2d05dba2b25ecb0f8fc3a0b4eb2232da6454a47b ]
When calling request_threaded_irq() with a CP2112, the function cp2112_gpio_irq_startup() is called in a IRQ context.
Therefore we can not sleep, and we can not call cp2112_gpio_direction_input() there.
Move the call to cp2112_gpio_direction_input() earlier to have a working driver.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/hid/hid-cp2112.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c index 8bbe3d0cbe5d9..8fd44407a0df7 100644 --- a/drivers/hid/hid-cp2112.c +++ b/drivers/hid/hid-cp2112.c @@ -1152,8 +1152,6 @@ static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); - cp2112_gpio_direction_input(gc, d->hwirq); - if (!dev->gpio_poll) { dev->gpio_poll = true; schedule_delayed_work(&dev->gpio_poll_worker, 0); @@ -1201,6 +1199,12 @@ static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, return PTR_ERR(dev->desc[pin]); } + ret = cp2112_gpio_direction_input(&dev->gc, pin); + if (ret < 0) { + dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n"); + goto err_desc; + } + ret = gpiochip_lock_as_irq(&dev->gc, pin); if (ret) { dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); -- 2.20.1
|