Found a new way to hang my IDE CD

[Meelis Roos <mroos@linux.ee>]

I'm back with my old IDE CD problem - the one that got DMA broken in 2.4 
(see http://www.ussg.iu.edu/hypermail/linux/kernel/0410.3/0480.html). I 
again stumped upon a problem that hangs IDE CD access with Sony CDU5211 
on ICH2. Running 2.6.14-rc3 + yesterdays git.

I tried "blktool /dev/hdc id" and it hangs in D state in blk_execute_rq. 
Dmesg tells

hdc: CDU5211, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
[...]
hdc: ATAPI 52X CD-ROM drive, 120kB Cache, UDMA(33)
[...]

hdc: DMA interrupt recovery
hdc: lost interrupt
hdc: status timeout: status=0xd0 { Busy }
ide: failed opcode was: unknown
hdc: DMA disabled
hdc: drive not ready for command
hdc: ATAPI reset complete
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)
hdc: lost interrupt
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_FAILED REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)
hdc: lost interrupt
cdrom_pc_intr, write: dev hdc: flags = REQ_STARTED REQ_PC REQ_FAILED REQ_QUIET
sector 0, nr/cnr 0/0
bio 00000000, biotail 00000000, buffer 00000000, data 00000000, len 0
cdb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x02)

and so on every now and then.

--
Meelis Roos (mroos@linux.ee)
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