An ATA controller in native mode may have one or more channels disabled
and not assigned resources. In that case the existing code crashes trying
to access I/O ports 0-7.
Add the neccessary check.
Signed-off-by: Alan Cox <[email protected]>
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.20-rc3-mm1/drivers/ata/libata-sff.c linux-2.6.20-rc3-mm1/drivers/ata/libata-sff.c
--- linux.vanilla-2.6.20-rc3-mm1/drivers/ata/libata-sff.c 2007-01-05 13:09:36.000000000 +0000
+++ linux-2.6.20-rc3-mm1/drivers/ata/libata-sff.c 2007-01-05 14:08:32.000000000 +0000
@@ -831,6 +831,21 @@
}
#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
@@ -862,6 +877,13 @@
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);
-
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