From: Tejun Heo sis_init_one() modifies probe_ent->port_flags after allocating and initializing it using ata_pci_init_native_mode(). This makes port_flags for the secondary port (probe_ent->pinfo2->flags) go out of sync resulting in misdetection of device due to incorrectly initialized SCR access flag. This patch make probe_ent alloc/init happen after the final port flags value is determined. This is fragile but probe_ent and all the related mess are scheduled to go away soon for exactly this reason. We just need to hold everything together till then. This has been spotted and diagnosed and tested by Patrick McHardy. Signed-off-by: Tejun Heo Cc: Patric McHardy Cc: Jeff Garzik Signed-off-by: Andrew Morton --- drivers/ata/sata_sis.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) diff -puN drivers/ata/sata_sis.c~sata_sis-fix-flags-handling-for-the-secondary-port drivers/ata/sata_sis.c --- a/drivers/ata/sata_sis.c~sata_sis-fix-flags-handling-for-the-secondary-port +++ a/drivers/ata/sata_sis.c @@ -240,7 +240,7 @@ static int sis_init_one (struct pci_dev struct ata_probe_ent *probe_ent = NULL; int rc; u32 genctl; - struct ata_port_info *ppi[2]; + struct ata_port_info pi = sis_port_info, *ppi[2] = { &pi, &pi }; int pci_dev_busy = 0; u8 pmr; u8 port2_start; @@ -265,27 +265,20 @@ static int sis_init_one (struct pci_dev if (rc) goto err_out_regions; - ppi[0] = ppi[1] = &sis_port_info; - probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY); - if (!probe_ent) { - rc = -ENOMEM; - goto err_out_regions; - } - /* check and see if the SCRs are in IO space or PCI cfg space */ pci_read_config_dword(pdev, SIS_GENCTL, &genctl); if ((genctl & GENCTL_IOMAPPED_SCR) == 0) - probe_ent->port_flags |= SIS_FLAG_CFGSCR; + pi.flags |= SIS_FLAG_CFGSCR; /* if hardware thinks SCRs are in IO space, but there are * no IO resources assigned, change to PCI cfg space. */ - if ((!(probe_ent->port_flags & SIS_FLAG_CFGSCR)) && + if ((!(pi.flags & SIS_FLAG_CFGSCR)) && ((pci_resource_start(pdev, SIS_SCR_PCI_BAR) == 0) || (pci_resource_len(pdev, SIS_SCR_PCI_BAR) < 128))) { genctl &= ~GENCTL_IOMAPPED_SCR; pci_write_config_dword(pdev, SIS_GENCTL, genctl); - probe_ent->port_flags |= SIS_FLAG_CFGSCR; + pi.flags |= SIS_FLAG_CFGSCR; } pci_read_config_byte(pdev, SIS_PMR, &pmr); @@ -306,6 +299,12 @@ static int sis_init_one (struct pci_dev port2_start = 0x20; } + probe_ent = ata_pci_init_native_mode(pdev, ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY); + if (!probe_ent) { + rc = -ENOMEM; + goto err_out_regions; + } + if (!(probe_ent->port_flags & SIS_FLAG_CFGSCR)) { probe_ent->port[0].scr_addr = pci_resource_start(pdev, SIS_SCR_PCI_BAR); _