2011/12/4 <michi1@michaelblizek.twilightparadox.com>:
Hi!
On 21:56 Sat 03 Dec , onlyfever wrote:
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!