[ivtv-devel] IVTV_IRQ_DEC_DMA_ERR

GREG LINDLEY glindley2 at msn.com
Tue Feb 21 16:29:44 CET 2006


Maksym,

Don't know if any of this applies, but here is another reason you can see 
this problem:

http://ivtvdriver.org/trac/ticket/54


>From: Maksym Veremeyenko <verem at m1stereo.tv>
>Reply-To: Discussion list for development of the IVTV 
>driver<ivtv-devel at ivtvdriver.org>
>To: ivtv-devel at ivtvdriver.org
>Subject: Re: [ivtv-devel] IVTV_IRQ_DEC_DMA_ERR
>Date: Tue, 21 Feb 2006 14:12:09 +0200
>
>Jack Trout ÐÉÛÅÔ:
>
> >     Connecting USB flash device cause DMA error:
> >
> >     Feb 21 02:13:49 dev-2 kernel: usb 1-1: new full speed USB device 
>using
> >     uhci_hcd and address 2
> >     Feb 21 02:13:49 dev-2 kernel: ivtv0 warning: IRQ: 
>IVTV_IRQ_DEC_DMA_ERR
> >     Feb 21 02:13:49 dev-2 kernel: ivtv0 warning: IRQ: 
>IVTV_IRQ_DEC_DMA_ERR
> >     Feb 21 02:13:51 dev-2 kernel: SCSI subsystem initialized
> >     Feb 21 02:13:51 dev-2 kernel: Initializing USB Mass Storage 
>driver...
> >
> >     i use kernel 2.6.15.1 <http://2.6.15.1> with ivtv trunk rev 3149
> >
> > I got this error when I had my pvr250 sharing an IRQ with my other
> > devices, I only was able to fix it by moving the card slots the cards
> > they were place in to different slots, and then assigning those slots
> > unused IRQs, probably means your usb bus assigns the flash drive the
> > same irq as your card
>
>usb do not share IRQ with ivtv:
>
>[root at dev-2 ~]# cat /proc/interrupts
>             CPU0
>    0:   16534161          XT-PIC  timer
>    1:         48          XT-PIC  i8042
>    2:          0          XT-PIC  cascade
>    8:          1          XT-PIC  rtc
>    9:    6266144          XT-PIC  ide3, ivtv0
>   10:        361          XT-PIC  uhci_hcd:usb1
>   11:    5524375          XT-PIC  eth0, mga at pci:0000:01:00.0, matroxfb
>   12:        138          XT-PIC  i8042
>   14:     447180          XT-PIC  ide0
>   15:         86          XT-PIC  ide1
>NMI:          0
>ERR:          0
>
>ide3 activity do not fails ivtv working...
>
>--
>________________________________________
>Maksym Veremeyenko
>Senior System Administrator
>IT Department
>Ukrainian Music Television Channel "M1"
>
>DDI. +380 44 205-44-92
>Tel. +380 44 205-44-80
>Fax. +380 44 205-44-82
>Cell. +380-67-447-22-43
>
>E-mail : Maksym.Veremeyenko at m1stereo.tv
>Web site: www.m1stereo.tv
>
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