Cheers
-- mlord@pobox.comKlaus Kudielka wrote: > > Hello, > > I have a Sony VAIO 505V and a few Compactflash cards. > BM-DMA on /dev/hda works perfectly only if I _don't_ insert any of those > CF cards (at least I had uptimes of a week without any problems). > > _If_ I insert a CF card, I may get a DMA timeout on /dev/hda immediately or > several hours later. If I let the system running, eventually I get > quite corrupted ext2 filesystems. > > The cause of the problem seems to be in the IDE driver. Basically, > ide_scan_pcibus() detects two IDE controllers at boot, ide0 and ide1. > ide_setup_pci_device() then sets up the data structures for ide0 and ide1. > ide1 doesn't have any drive attached, and thus probe_hwif() doesn't set > the hwif->present flag. > > Now, when the PCMCIA subsystem calls ide_register, ide1 gets re-used, > because the hwif->present flag is zero. And this seems to be bad. > > I work around this problem by forcing the base I/O address of the > CF card to be 0x160, which causes ide_register() to use ide5 instead. > But the correct solution, IMHO, would be either > > * avoid re-use of a PCI IDE interface entry which has no drives > attached (probably by just setting hwif->present to 1?) > > or > > * when re-using the entry, make sure that all data structures are > set up correctly. I didn't check, but suspect that AT LEAST > ide_hwifs[0]->mate still points to ide_hwifs[1]. Also, free > the I/O region occupied by ide_setup_dma(). > > Now the question to the IDE specialists: Which one is better? > > -Klaus > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/
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