Messages in this thread | | | Date | Wed, 1 Feb 2012 13:29:29 +0100 | Subject | Re: Handling <Ctrl-c> like events in 's_power' implementation when we have a GPIO controlling the sensor CE | From | Linus Walleij <> |
| |
On Wed, Feb 1, 2012 at 6:01 AM, Bhupesh SHARMA <bhupesh.sharma@st.com> wrote:
> Our board has a I2C controlled camera sensor whose Chip Enable (CE) > pin is driven via a GPIO. This GPIO is made available by a I2C-to-GPIO > expander chip (STMPE801, see user manual [1]) (...) > the I2C controller driver > (we use the standard SYNOPSYS designware device driver present in mainline, > see [3]) returns -ERESTARTSYS in response to the write command we had requested > for putting the sensor to power-off state (as it has received the <ctrl-c> kill > signal).
So what happens if you go into the I2C driver and replace all things that look like this:
ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ);
With this: ret = wait_for_completion_timeout(&dev->cmd_complete, HZ);
(Non-interruptible.)
This is usually the problem.
Yours, Linus Walleij
| |