kern/118093: firewire bus reset hogs CPU, causing data to be lost

[Dieter]

The following reply was made to PR kern/118093; it has been noted by GNATS.

From: Dieter <freebsd at sopwith.solgatos.com>
To: freebsd-firewire at freebsd.org, freebsd-drivers at freebsd.org
Cc: bug-followup at FreeBSD.org
Subject: Re: kern/118093: firewire bus reset hogs CPU, causing data to be lost 
Date: Sun, 14 Dec 2008 19:30:04 +0000

 I found the source of this problem.  When a firewire bus resets,
 the firewire driver prints a few lines to the console,
 using printf(9) and device_printf(9).  I suspect that these are
 running at splfw aka splimp, locking out other i/o.
 
 Commenting out the *printf() calls fixes the problem, but that
 isn't a good solution.
 
 Would changing the *printf() calls to log(9) calls be safe?
 ("safe" meaning other i/o doesn't get locked out)
 
 Ah, for the good old days when 19200 baud seemed fast...