Re: [REGRESSION] media: cx23885 broken by commit 453afdd "[media] cx23885: convert to vb2"

[Raimonds Cicans <ray@apollo.lv>]

On 29.01.2015 09:33, Hans Verkuil wrote:
> On 01/11/2015 10:33 AM, Raimonds Cicans wrote:
>> I contacted you because I am hit by regression caused by your commit:
>> 453afdd "[media] cx23885: convert to vb2"
>>
>>
>> My system:
>> AMD Athlon(tm) II X2 240e Processor on Asus M5A97 LE R2.0 motherboard
>> TBS6981 card (Dual DVB-S/S2 PCIe receiver, cx23885 in kernel driver)
>>
>> After upgrade from kernel 3.13.10 (do not have commit) to 3.17.7
>> (have commit) I started receiving following IOMMU related messages:
>>
>> 1)
>> AMD-Vi: Event logged [IO_PAGE_FAULT device=0a:00.0 domain=0x001d
>> address=0x000000000637c000 flags=0x0000]
>>
>> where device=0a:00.0 is TBS6981 card
> As far as I can tell this has nothing to do with the cx23885 driver but is
> a bug in the amd iommu/BIOS. See e.g.:
>
> https://bbs.archlinux.org/viewtopic.php?pid=1309055
>
> I managed to reproduce the Intel equivalent if I enable CONFIG_IOMMU_SUPPORT.
>
> Most likely due to broken BIOS/ACPI/whatever information that's read by the
> kernel. I would recommend disabling this kernel option.
>
Maybe...

But on other hand this did not happen on old kernel with old driver.
And when I did bisection on old kernel + media tree I started to
receive this message only on new driver.

And I can not disable this feature because then USB and LAN
stop working.


Ray