Recent ide patches and DMA

[Kafu Nagai]

With recent ide patches, the ide driver seems to try to use DMA mode even for a drive which dosen't support it. CONFIG_IDEDMA_PCI_AUTO is enabled but even so with the stock kernel this dosen't happen. older patches didn't have this behavior either. Is this change intentional ?

hdc: 333630 sectors (171 MB) w/32KiB Cache, CHS=1011/15/22, DMA
Partition check:
 hda: hda1 hda2 hda3 hda4 < hda5 hda6 hda7 hda8 >
 hdc:hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hdc: dma_intr: error=0x04 { DriveStatusError }
hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hdc: dma_intr: error=0x04 { DriveStatusError }
hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hdc: dma_intr: error=0x04 { DriveStatusError }
hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hdc: dma_intr: error=0x04 { DriveStatusError }
hdc: DMA disabled
ide1: reset: success
 hdc1

~ $ hdparm -i /dev/hdc
 
/dev/hdc:
 
 Model=QUANTUM ELS170A, FwRev=4.20, SerialNo=166304085456
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>5Mbs RotSpdTol>.5% }
 RawCHS=1011/15/22, TrkSize=11264, SectSize=512, ECCbytes=4
 BuffType=3(DualPortCache), BuffSize=32kB, MaxMultSect=8, MultSect=off
 DblWordIO=no, OldPIO=2, DMA=no
 CurCHS=1011/15/22, CurSects=333629, LBA=no                                         

This may not be a major problem, as nobody probably uses such an obsolete drive nowadays.
 
The following patches have been tried:

ide.2.2.18-22.all.20001120
ide.2.4.0-t11.1120.patch

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