On Wed, Mar 27, 2013 at 07:33:47PM +0530, Ritesh Harjani wrote: > > Hi guys > > I am facing following deadlock on my ARM SMP machine and thought of mailing you > guys for any valuable suggestions on this. > > [Problem] > 1. In serial8250_handle_irq function after acquiring a spin_lock, I want to > print some debug info. This printk will call serial8250_console_write function. > This function too tries to acquire the same spin_lock and spins on it if > someone else already acquired it. Assume that this scenario happened on cpu0, > that means this situation will create a deadlock (as cpu0 will busy spin for > acquiring a lock which it had already acquired). Then don't do that :) Use the tracing infrastructure if you really want to do debug stuff from within your console irq handler. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
