diff options
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-sff.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index 12c88c588039..cfa9ed179d9c 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -832,6 +832,21 @@ void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc) } #ifdef CONFIG_PCI + +static int ata_resources_present(struct pci_dev *pdev, int port) +{ + int i; + + /* Check the PCI resources for this channel are enabled */ + port = port * 2; + for (i = 0; i < 2; i ++) { + if (pci_resource_start(pdev, port + i) == 0 || + pci_resource_len(pdev, port + i) == 0) + return 0; + } + return 1; +} + /** * ata_pci_init_native_mode - Initialize native-mode driver * @pdev: pci device to be initialized @@ -863,6 +878,13 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int probe_ent->irq = pdev->irq; probe_ent->irq_flags = IRQF_SHARED; + + /* Discard disabled ports. Some controllers show their + unused channels this way */ + if (ata_resources_present(pdev, 0) == 0) + ports &= ~ATA_PORT_PRIMARY; + if (ata_resources_present(pdev, 1) == 0) + ports &= ~ATA_PORT_SECONDARY; if (ports & ATA_PORT_PRIMARY) { probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0); |