Hi, I confirmed the NULL pointer dereference bug was fixed in 2.6.15.5 kernel. The PIO mode of Sil3112A works well. HOWEVER, the 2.4.32 kernel reproduces the NULL pointer dereference bug!! Please give me hints to fix this problem!! > I have a defective device, ARAID 99 2000 (RAID0 mode). > I want to use this RAID system connected with the Sil3112A PCI > card. However, this RAID system does not work on DMA mode. > > So I modified the kernel code (sata_sil.c) to use the PIO > mode as follows. However, the kernel reports `kernel NULL pointer > dereference at virtual address 0000002c' in the dmesg. The > screen shot is here: > http://www.a.phys.nagoya-u.ac.jp/~cyamauch/p1030021.jpg > > > Doesn't Sil3112A support PIO mode? > > > *** /usr/src/linux-2.4.31/drivers/scsi/sata_sil.c._orig_ Wed Jun 1 09:56:34 2005 > --- /usr/src/linux-2.4.31/drivers/scsi/sata_sil.c Wed Feb 22 08:49:03 2006 > *************** > *** 67,72 **** > --- 67,73 ---- > SIL_INTR_STEERING = (1 << 1), > SIL_QUIRK_MOD15WRITE = (1 << 0), > SIL_QUIRK_UDMA5MAX = (1 << 1), > + SIL_QUIRK_ARAID = (1 << 2), > }; > > static int sil_init_one (struct pci_dev *pdev, const struct pci_device_id *ent); > *************** > *** 106,111 **** > --- 107,113 ---- > { "ST380011ASL", SIL_QUIRK_MOD15WRITE }, > { "ST3120022ASL", SIL_QUIRK_MOD15WRITE }, > { "ST3160021ASL", SIL_QUIRK_MOD15WRITE }, > + { "ASI ARAID99 2000", SIL_QUIRK_ARAID }, > { "Maxtor 4D060H3", SIL_QUIRK_UDMA5MAX }, > { } > }; > *************** > *** 345,350 **** > --- 347,360 ---- > ap->udma_mask &= ATA_UDMA5; > return; > } > + > + if (quirks & SIL_QUIRK_ARAID) { > + printk(KERN_INFO "ata%u(%u): applying ASI ARAID99 errata fix %s\n", > + ap->id, dev->devno, s); > + ap->udma_mask = 0; > + ap->mwdma_mask = 0; > + return; > + } > } > > static int sil_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) > > > == Chisato Yamauchi ================================= > - > : send the line "unsubscribe linux-ide" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html == Chisato Yamauchi ================================= - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
