Hello,
I have recently got slave usb working on 823/850 boards.
now i am facing a severe problem only when klogd is started.
problem is that , as klogd sets a console_loglevel i am
getting the prints of usb messages on screen very very
unpredictably.
even usb stops generating receive and transmit interrupts
if i don't enforce the changes in kernel/printk.c
like below..
ORIGINAL CODE THAT DOESN'T WORK
----------------------------------
if (msg_level < console_loglevel && console_drivers)
{
struct console *c = console_drivers;
while(c) {
if ((c->flags & CON_ENABLED) && c->write)
c->write(c, msg, p - msg + line_feed);
c = c->next;
}
HACK THAT MAKES IT WORK
-----------------------
if (console_drivers)
{
struct console *c = console_drivers;
while(c) {
if ((c->flags & CON_ENABLED) && c->write)
c->write(c, msg, p - msg + line_feed);
c = c->next;
}
point to note is that usb interrupt is among the highest priority
while the uart is quite lower one also usb generates lot of
interrupts ( one msec. SOF)
basically it works if it is made to print on SCREEN .
also it will work when you set (KERN_EMERG) in printk.
my interupt hasndler runs as kernel thread.
alternatively it also works when i enable the DEBUG options (lot
of printk's in usb routines)
can any body sugest me some pointer..?
Best Regards,
Ashish
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