Re: kernel panic with simple driver

From: Greg KH
Date: Tue Aug 09 2011 - 22:17:46 EST

On Wed, Aug 10, 2011 at 10:33:28AM +0900, Murali K. Vemuri wrote:
> There is no concurrent access to the timer. The design is that:
> 1.Driver provides an IOCTL for start / stop
> 2. when the driver receives START IOCTL, it toggles some GPIOs to ON / OFF.
> 3. the GPIOs will be ON for 500 MSec and OFF for 500 MSec.
> 4. Two successive START IOCTLs will not be honored.
> 5. There is only one application that uses these IOCTLs
> 6. When I receive a STOP IOCTL, I am doing :
> if (timer_pending (&my_timer))
> del_timer(&my_timer);

What kind of driver is this? For what type of hardware?

Can't you control the gpios from userspace with out any need to write a
kernel driver?


greg k-h
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