Re: [PATCH] For test only: pmac_zilog fixes (cups lockup at boot):

Russell King
2004-03-05T09:48:13Z

On Fri, Mar 05, 2004 at 08:29:12PM +1100, Benjamin Herrenschmidt wrote:
>
> > Yes, I know - but the point is its impossible to review, and I think
> > you at least have an extra level of locking which isn't needed.
> >
> > But I wouldn't know because of the huge number of changes which make
> > it impossible to read.
>
> That semaphore locking is only used to guard open/close against the
> power management callback. It greatly simplify the deal with the shared
> irq (the irq is shared between both ports). It's not used during
> normal operations.

Err. What power management callback? Are you not using uart_suspend_port
and uart_resume_port?

These functions do all the locking for you already - using state->sem.

Like I said, I can't see the twigs for the forest due to the shear
noise caused by the up -> uap change.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/
2.6 Serial core