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

[Katsushi Kobayashi]

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

From: Katsushi Kobayashi <ikob at ni.aist.go.jp>
To: Dieter <freebsd at sopwith.solgatos.com>
Cc: freebsd-firewire at freebsd.org,
 freebsd-drivers at freebsd.org,
 bug-followup at freebsd.org
Subject: Re: kern/118093: firewire bus reset hogs CPU,	causing data to be lost
Date: Tue, 16 Dec 2008 14:17:10 +0900

 Hi, 
 
 I believe no side effect is anticipated the message.
 "side effect" includes locking i/o.
 
 ----
 Katsushi Kobayashi
 
 
 
 
 On 2008/12/15, at 4:30, Dieter wrote:
 
 > 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...
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