Re: readcd hangs in blk_execute_rq

[Jens Axboe <axboe@suse.de>]

On Thu, Oct 21 2004, Meelis Roos wrote:
> I'm trying to readcd a cd, in 2.6.9+todays BK snapshot.
> 
> I got an error the first time so I started it (readcd dev=/dev/hdc)
> the second time and chose c2scan. This resulted in the messages
> ...
> end:    328460
> C2 in sector: 1864 first at byte: 2256 (0xF0) total:   72 errors
> C2 in sector: 1865 first at byte:   12 (0x0F) total: 2335 errors
> addr:     2499 cnt: 49
> 
> And here it hangs. ps shows readcd is in D state, in blk_execute_rq.
> dmesg shows lines of
> 
> hdc: lost interrupt
> 
> every no and then.
> 
> This a IDE CD on Intel ICH2 ide controller:
> 
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> ICH2: IDE controller at PCI slot 0000:00:1f.1
> ICH2: chipset revision 2
> ICH2: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
>     ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
> 
> hdc: CDU5211, ATAPI CD/DVD-ROM drive
> hdc: ATAPI 52X CD-ROM drive, 120kB Cache, UDMA(33)
> 
> And after every boot it gets DMA timeout on first read and switches to
> PIO mode and works fine there reading data cd-s (even browsing the same
> CD):
> 
> ide-cd: cmd 0x28 timed out
> hdc: DMA interrupt recovery
> hdc: lost interrupt
> hdc: status timeout: status=0xd0 { Busy }
> hdc: status timeout: error=0x00
> hdc: DMA disabled
> hdc: drive not ready for command
> hdc: ATAPI reset complete

Did it previously work reliably with dma (which kernel)? Does it now
work reliably without dma now? Do send your entire dmesg after a boot
too, btw.

-- 
Jens Axboe