netdev - Re: [Bugme-new] [Bug 12969] New: WARNING: at lib/dma-debug.c:539 check

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Date:	Fri, 03 Apr 2009 03:23:39 +0100
From:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	zambrano@...adcom.com, bugme-daemon@...zilla.kernel.org,
	netdev@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: Re: [Bugme-new] [Bug 12969] New: WARNING: at lib/dma-debug.c:539
 check_sync+0xe9/0x341() (Not tainted)

On Wed, 2009-04-01 at 16:50 -0700, Andrew Morton wrote:
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> 
> On Sun, 29 Mar 2009 11:43:19 GMT
> bugzilla-daemon@...zilla.kernel.org wrote:
> 
> > http://bugzilla.kernel.org/show_bug.cgi?id=12969
> > 
> >            Summary: WARNING: at lib/dma-debug.c:539
> >                     check_sync+0xe9/0x341() (Not tainted)
> >            Product: Drivers
> >            Version: 2.5
> >           Platform: All
> >         OS/Version: Linux
> >               Tree: Fedora
> >             Status: NEW
> >           Severity: normal
> >           Priority: P1
> >          Component: Network
> >         AssignedTo: drivers_network@...nel-bugs.osdl.org
> >         ReportedBy: sergio@...giomb.no-ip.org
> >         Regression: Yes
> > 
> > 
> > ------------[ cut here ]------------                                            
> > WARNING: at lib/dma-debug.c:539 check_sync+0xe9/0x341() (Not tainted)           
> > Hardware name: HP Compaq nx6110 (PY501EA#AB9)                                   
> > b44 0000:02:0e.0: DMA-API: device driver tries to sync DMA memory it has not
> > allocated [device address=0x0000000075941040] [size=1566 bytes]  
> > Modules linked in: llc bnep l2cap bluetooth autofs4 lm90 hwmon i2c_i801 sunrpc
> > ipv6 cpufreq_ondemand acpi_cpufreq uinput snd_intel8x0m snd_intel8x0
> > snd_ac97_codec snd_seq_dummy ac97_bus snd_seq_oss snd_seq_midi_event snd_seq
> > snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm b44 ssb firewire_ohci
> > snd_timer ipw2200 iTCO_wdt mii firewire_core snd iTCO_vendor_support libipw
> > yenta_socket crc_itu_t lib80211 rsrc_nonstatic soundcore snd_page_alloc joydev
> > pcspkr wmi serio_raw ata_generic pata_acpi i915 drm i2c_algo_bit i2c_core video
> > output [last unloaded: scsi_wait_scan]                                          
> > Pid: 2418, comm: S58ntpd Not tainted 2.6.29-16.fc10.i686.PAE #1                 
> > Call Trace:                                                                     
> >  [<c04396d1>] warn_slowpath+0x7c/0xbd                                           
> >  [<c0457fe1>] ? register_lock_class+0x17/0x290                                  
> >  [<c0458d61>] ? mark_lock+0x1e/0x349                                            
> >  [<c0556448>] ? _raw_spin_unlock+0x74/0x78                                      
> >  [<c0458d61>] ? mark_lock+0x1e/0x349                                            
> >  [<c055a060>] ? check_sync+0x37/0x341                                           
> >  [<c055a112>] check_sync+0xe9/0x341                                             
> >  [<c0711245>] ? _spin_unlock_irqrestore+0x45/0x55                               
> >  [<c04592db>] ? trace_hardirqs_on+0xb/0xd                                       
> >  [<c055a4d1>] debug_dma_sync_single_for_device+0x2f/0x39                        
> >  [<f828f722>] dma_sync_single_for_device+0x4a/0x59 [b44]                        
> >  [<f828f76f>] ssb_dma_sync_single_for_device+0x3e/0x48 [b44]                    
> >  [<f8291d1e>] b44_recycle_rx+0x18c/0x196 [b44]                                  
> >  [<f8291f9f>] b44_poll+0x277/0x3c0 [b44]                                        
> >  [<c0687bb9>] net_rx_action+0xa1/0x1ca                                          
> >  [<c043e30a>] __do_softirq+0x9d/0x154                                           
> >  [<c043e413>] do_softirq+0x52/0x7e                                              
> >  [<c043e56f>] irq_exit+0x49/0x77                                                
> >  [<c040b22e>] do_IRQ+0x97/0xad                                                  
> >  [<c0409dac>] common_interrupt+0x2c/0x34                                        
> 
> This would appear to be reporting a bug in b44's DMA API usage.  

Hi!, are you saying that could be a bug in new DMA-API ? (if we have
one) 

I don't had problems before with this b44 and laptop is not new.
With kernel 2.6.29, I am testing KMS on new drm/dri Intel video, I also
have one big warning with i915 reported on
Bug 12419 - possible circular locking dependency on i915 dma.

What I would like to know is :  
Could bug 12419 make this warning on b44 ? or could DMA-API make the 2
warnings ? or the 2 warnings are completed different ? and the
combinations of this questions :)    


Thanks, 
> See
> the newly-added documentation in Documentation/DMA-API.txt, starting
> with
> 
> 	Part III - Debug drivers use of the DMA-API
> 
> The line numbers have changed, but it is:
> 
> 		err_printk(ref->dev, NULL, "DMA-API: device driver tries "
> 			   "to free DMA memory it has not allocated "
> 			   "[device address=0x%016llx] [size=%llu bytes]\n",
> 			   ref->dev_addr, ref->size);
> 
> 
-- 
Sérgio M. B.

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