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Diffstat (limited to 'drivers/ata/libata-sff.c')
-rw-r--r--drivers/ata/libata-sff.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 12c88c58803..cfa9ed179d9 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);