2011/12/4  [off-list ref]:

Hi!

On 21:56 Sat 03 Dec ? ? , onlyfever wrote:

quoted

Hi,
? ? I have a question about work queue.
I use queue_work() function in my TTY driver's write function (ch_tty_write()).
The TTY driver works fine,but when this driver is called from
ppp_write() function system would crash.

static int ch_tty_write(struct tty_struct *tty,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? const unsigned char *buf, int count)
{
? ? ? ......
? ? ? queue_work(xxx,xxxx);
? ? ? return count;
}

I want to know ?which context can't use queue_work() function?
Put the crash message below.

Unable to handle kernel NULL pointer dereference at virtual address 00000003

Please check that you have properly called "INIT_WORK" and do pass any null
pointers to either INIT_WORK or queue_work. If this does not help, please
give us a pointer on where to get your kernel tree.

? ? ? ?-Michi
--
programing a layer 3+4 network protocol for mesh networks
see http://michaelblizek.twilightparadox.com

I find the reason,the work queue has been destroyed before the work been called.

thanks.

Regards!