Re: kern/38758: LOCKDEBUG kernel hangs in esp(4) driver

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

The following reply was made to PR kern/38758; it has been noted by GNATS.

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost, 
netbsd-bugs%NetBSD.org@localhost,
        hauke%Espresso.Rhein-Neckar.DE@localhost, 
tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: kern/38758: LOCKDEBUG kernel hangs in esp(4) driver
Date: Tue, 27 May 2008 23:55:26 +0900

 >  sun3 uses real DMA, doesn't it? Different code paths, probably. The 
 >  mac68k MD code doesn't use simple_lock() anywhere, though.
 
 I think the problem is esp interrupts are implicitly enabled
 by spl2() in esp_quick_dma_go().
 
 I have no idea if there is a safe way to enable serial
 interrupts without enabling esp interrupts.
 ---
 Izumi Tsutsui