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libata-sff: Don't try and activate channels which are not in use 

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 <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan 2007-01-08 12:10:05 +00:00 committed by Jeff Garzik
parent d73f30e1c9
commit 4112e16a7c
1 changed files with 22 additions and 0 deletions
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22
drivers/ata/libata-sff.c
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@ -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);