linux-kernel - Re: [KJ] [PATCH] drivers/char/riscom8.c: save

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Date:	Sat, 14 Oct 2006 11:49:37 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Amol Lad <amol@...ismonetworks.com>,
	kernel Janitors <kernel-janitors@...ts.osdl.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [KJ] [PATCH] drivers/char/riscom8.c: save_flags()/cli()/sti()	removal

On Sat, Oct 14, 2006 at 03:20:02PM +0100, Alan Cox wrote:
> 1. The irq locking isn't doing anything as the IRQ handler itself is not
> taking the lock

Looks like you reviewed the first version instead of the version Amol
sent after Arjan critiqued that.

> 2. If the irq handler itself dumbly locks to fix this then we get
> tty_flip_buffer_push() re-entering the other code paths and deadlocking
> if low latency is enabled

Yep, still a problem with the revised patch.

> 3. Some of the use of local_save/spin_lock_irq seems over-clever and
> unneeded
> 
> Fixable but how about we just delete the file since it has been broken
> for ages and nobody can be using it ?

Only broken on SMP ...

I wouldn't mind writing a new driver (using the serial core) if someone
wants to send me one.  I need a multiport serial card anyway ...
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