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

Sean Bruno sbruno at miralink.com
Sun Dec 28 14:20:05 PST 2008


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

From: Sean Bruno <sbruno at miralink.com>
To: Dieter <freebsd at sopwith.solgatos.com>
Cc: freebsd-firewire at freebsd.org, bug-followup at freebsd.org
Subject: Re: kern/118093: firewire bus reset hogs CPU, causing data to be
 lost
Date: Sun, 28 Dec 2008 14:15:36 -0800

 Dieter wrote:
 >>> I confirmed that spl's are complete no-ops since rel 5.  So, you want 
 >>> to ignore
 >>> them as they are just markers now where locking should be implemented.
 >>>       
 >
 > I hunted down the spl code, and you're right.  Wow, I wonder how drivers
 > still using spl calls work at all?
 >
 >   
 I believe that the spl() calls are just left there as a hint where 
 locking should be.
 
 As far as I understand, we need to pay attention to the mutex locks.
 >> is to real behavior, but /var/log/messages has a tendency to get garbled 
 >> like this:
 >>
 >> Dec 22 16:00:18 home-test kernel: fwohci1: Initiate bus reset
 >> Dec 22 16:00:18 home-test kernel: fwohci1: BUS reset
 >> Dec 22 16:00:18 home-test kernel: fwohci1: node_id=0xc800ffc0, gen=8, 
 >> CYCLEMASTER mode
 >> Dec 22 16:00:18 home-test kernel: firewi
 >> Dec 22 16:00:18 home-test kernel: re1:
 >> Dec 22 16:00:18 home-test kernel: 1 n
 >> Dec 22 16:00:18 home-test kernel: odes
 >> Dec 22 16:00:18 home-test kernel: , ma
 >> Dec 22 16:00:18 home-test kernel: xhop
 >> Dec 22 16:00:18 home-test kernel: <=
 >> Dec 22 16:00:18 home-test kernel: 0, c
 >> Dec 22 16:00:18 home-test kernel: able
 >>     
 >
 > Do the lines get folded on the console, or only in /var/log/messages?
 >   
 
 As far as I can see, the console messages are fine.  It's only the 
 messages that get
 garbled.
 
 Sean


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