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sh: Bail out early on PCI resource conflicts.

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Presently we just call in to request_resource() for the ioport and iomem
resources without checking for errors. This has already hidden a couple
of bugs, so add some error handling in for good measure.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-01-29 22:22:27 +09:00
parent a45635dfb0
commit ac8ab54a8e
1 changed files with 9 additions and 13 deletions
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22
arch/sh/drivers/pci/pci.c
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@ -53,8 +53,12 @@ static DEFINE_MUTEX(pci_scan_mutex);
void __devinit register_pci_controller(struct pci_channel *hose)
{
request_resource(&iomem_resource, hose->mem_resource);
request_resource(&ioport_resource, hose->io_resource);
if (request_resource(&iomem_resource, hose->mem_resource) < 0)
goto out;
if (request_resource(&ioport_resource, hose->io_resource) < 0) {
release_resource(hose->mem_resource);
goto out;
}
*hose_tail = hose;
hose_tail = &hose->next;
@ -76,6 +80,9 @@ void __devinit register_pci_controller(struct pci_channel *hose)
pcibios_scanbus(hose);
mutex_unlock(&pci_scan_mutex);
}
out:
printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
}
static int __init pcibios_init(void)
@ -319,20 +326,9 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
if (flags & IORESOURCE_IO)
return ioport_map_pci(dev, start, len);
/*
* Presently the IORESOURCE_MEM case is a bit special, most
* SH7751 style PCI controllers have PCI memory at a fixed
* location in the address space where no remapping is desired.
* With the IORESOURCE_MEM case more care has to be taken
* to inhibit page table mapping for legacy cores, but this is
* punted off to __ioremap().
* -- PFM.
*/
if (flags & IORESOURCE_MEM) {
if (flags & IORESOURCE_CACHEABLE)
return ioremap(start, len);
return ioremap_nocache(start, len);
}