Re: Reg. kernel crash while using pixcir touchscreen driver

[Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>]

Hi Sachin,

On Thu, May 24, 2012 at 11:20:01AM +0530, Sachin Kamat wrote:
> Hi,
> 
> I encountered a kernel crash while integrating Pixcir touchscreen
> driver with one of our hardware. The log is attached at the end of the
> mail (inline).
> 
> The following ISR code:
> 
> while (!tsdata->exiting) {
>         pixcir_ts_poscheck(tsdata);
> 
>         if (tsdata->chip->attb_read_val())
>               break;
> 
>         msleep(20);
> }
> 
> seems to run until the if condition is false. However, when it exits
> the loop (when the condition becomes true), it crashes saying "exiting
> task "irq/438-pixcir_" (1011) is an active IRQ thread".

It actually crashes earlier, in pixcir_ts_isr() itself. The message is
coming from do_exit() when ISR thread dies. Did you porvide
attb_read_val implementation?

> 
> I have 2 questions here:
> 1. Do we need such a loop and the if condition. In my case it worked
> with the isr just doing
> pixcir_ts_poscheck(tsdata);
> 
> 2. What exactly is expected by attb_read_val() function.

I believe it is supposed to indicate if touch is detected so we can keep
polling.

Thanks.

-- 
Dmitry
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