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

[Russell King <rmk+lkml@arm.linux.org.uk>]

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