Hi,
I managed to find the cause for the crash.
In function e100_up(), the last few lines of code says,
napi_enable(&nic->napi);
/* enable ints _after_ enabling poll, preventing a race between
* disable ints+schedule */
e100_enable_irq(nic);
In my implementation, I need to have interrupts for every Tx and Rx. So I
disabled the napi functionality. This caused a system freeze as the comment
in the above snippet creates a race condition.
I would like to have a work around for this race condition.
Can you please explain what is that race condition? What will happen if we
don't poll before enabling the irq?
Suggest me a method to solve this race condition.
Thanks
Vikram
On Tue, Jan 25, 2011 at 10:21 AM, Vikram Narayanan <[email protected]>wrote:
> Hi all,
>
> I am integrating the e100.c driver to one of my application specific
> network protocol stack which runs as a kernel module.
> The ethernet controller used is Intel 82562.
> Kernel version is 2.6.33.7
> When I insmod my kernel module, It will initialise the e100 driver too. My
> system freezed after inserting the module.
> By using printks I found that the freeze happens during the call to the
> function e100_enable_irq().
> The function has a iowrite
> iowrite8(irq_mask_none, &nic->csr->scb.cmd_hi);
> When I comment the above line, there is no system freeze. But the
> interrupts aren't enabled, which is obviously of no use to me :)
> I would like to know
> i) Why the system freezes when i enable the IRQ. My IRQ number for this
> ethernet controller in my system is 20.
> ii) How to solve this system freeze?
>
> I would be happy to provide more inputs if needed.
>
> --
> Be the change you want to see in the world
>
> Regards
> Vikram
>
> Support Freedom
> http://www.fsf.org/
>
> Donate to FSF
> https://my.fsf.org/donate
>
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