Re: MSI broken in libata?

Tejun Heo
2010-01-09T23:16:33Z

On 12/25/2009 06:22 PM, Torsten Kaiser wrote:
> As reported in http://lkml.org/lkml/2009/12/19/82 the new MSI support
> for sata_sil24 does not work for me.
> This is still the same with 2.6.33-rc2.
>
> Why I think, this might be a problem within libata:
> * other drivers can use MSI successful on my system (tg3, radeon, hda-intel)
> * happens both in sata_sil24 and sata_nv
> * the count in /proc/interrupts increases for the MSIs assigned to
> sata_sil24/sata_nv, so interrupt delivery seems to work
> * only writing seems to fail

How does it fail? Timeouts? Also, ahci enables MSI by default if
available and works fine on many configurations so I don't think
anything in libata core layer is broken regarding MSI (there just
isn't anything which can break).

Thanks.

--
tejun