From: Andrey Borzenkov <arvidjaar@mail.ru>
To: Tejun Heo <tj@kernel.org>
Subject: Re: 2.6.28-rc3: WARN_ON(ap->nr_active_links) in ata_eh_finish() with pata_ali DMA CD-ROM
Date: Sun, 16 Nov 2008 15:59:07 +0300
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On Tuesday 11 November 2008, Tejun Heo wrote:
> Andrey Borzenkov wrote:
> > Every now and then I give pata_ali CD-ROM DMA a test. This time I got
> > someting new - not only usual timeouts but also WARN_ON. There was a
> > whole bunch of subsequent WARN_ON's, but they are likely to be just
> > followup errors.
> >=20
> > Also, in the past ejecting media from drive would abort processing and
> > all commands waiting for completion would return to prompt. Now they
> > seem to hang forever.
>=20
> The next -rc should fix this.  Thanks.
>=20


rc5 is the first release ever that correctly falls back to PIO from DMA
on ATAPI connected to pata_ali. Wow! Thank you!

[ 5882.999971] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 fr=
ozen
[ 5883.000023] ata2.00: cmd a0/01:00:00:00:08/00:00:00:00:00/a0 tag 0 dma 2=
048 in
[ 5883.000027]          cdb 28 00 00 00 00 1a 00 00  01 00 00 00 00 00 00 00
[ 5883.000032]          res 40/00:02:00:08:00/00:00:00:00:00/a0 Emask 0x4 (=
timeout)
[ 5883.000046] ata2.00: status: { DRDY }
[ 5883.000162] ata2: soft resetting link
[ 5883.160062] ata2.00: configured for UDMA/33
[ 5883.160391] ata2: EH complete
[ 5913.999844] ata2.00: limiting speed to UDMA/25:PIO4
[ 5913.999885] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 fr=
ozen
[ 5913.999917] ata2.00: cmd a0/01:00:00:00:08/00:00:00:00:00/a0 tag 0 dma 2=
048 in
[ 5913.999922]          cdb 28 00 00 00 00 1a 00 00  01 00 00 00 00 00 00 00
[ 5913.999927]          res 40/00:02:00:08:00/00:00:00:00:00/a0 Emask 0x4 (=
timeout)
[ 5913.999941] ata2.00: status: { DRDY }
[ 5914.000064] ata2: soft resetting link
[ 5914.160239] ata2.00: configured for UDMA/25
[ 5914.160601] ata2: EH complete
[ 5944.999646] ata2.00: limiting speed to PIO4
[ 5944.999682] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 fr=
ozen
[ 5944.999715] ata2.00: cmd a0/01:00:00:00:08/00:00:00:00:00/a0 tag 0 dma 2=
048 in
[ 5944.999719]          cdb 28 00 00 00 00 1a 00 00  01 00 00 00 00 00 00 00
[ 5944.999724]          res 40/00:02:00:08:00/00:00:00:00:00/a0 Emask 0x4 (=
timeout)
[ 5944.999738] ata2.00: status: { DRDY }
[ 5944.999852] ata2: soft resetting link
[ 5945.154330] ata2.00: configured for PIO4
[ 5945.154693] ata2: EH complete

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