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[POWERPC] Make OF irq map code detect more error cases

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Device-tree bugs on js20 with some versions of SLOF were causing the
interrupt for IDE to not be parsed correctly and fail to boot. This
patch adds a bit more sanity checking to the parser to detect some of
those errors and fail instead of returning bogus information.  The
powerpc PCI code can then trigger a fallback that works on those
machines.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2006-08-25 14:46:23 +10:00
committed by Paul Mackerras
parent 7233593b78
commit 006b64de60
3 changed files with 25 additions and 7 deletions
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17
arch/powerpc/kernel/prom_parse.c
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@@ -639,14 +639,17 @@ void of_irq_map_init(unsigned int flags)
}
int of_irq_map_raw(struct device_node *parent, u32 *intspec, u32 *addr,
struct of_irq *out_irq)
int of_irq_map_raw(struct device_node *parent, u32 *intspec, u32 ointsize,
u32 *addr, struct of_irq *out_irq)
{
struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
u32 *tmp, *imap, *imask;
u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
int imaplen, match, i;
DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
parent->full_name, intspec[0], intspec[1], ointsize);
ipar = of_node_get(parent);
/* First get the #interrupt-cells property of the current cursor
@@ -670,6 +673,9 @@ int of_irq_map_raw(struct device_node *parent, u32 *intspec, u32 *addr,
DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
if (ointsize != intsize)
return -EINVAL;
/* Look for this #address-cells. We have to implement the old linux
* trick of looking for the parent here as some device-trees rely on it
*/
@@ -875,12 +881,15 @@ int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq
}
intsize = *tmp;
DBG(" intsize=%d intlen=%d\n", intsize, intlen);
/* Check index */
if ((index + 1) * intsize > intlen)
return -EINVAL;
/* Get new specifier and map it */
res = of_irq_map_raw(p, intspec + index * intsize, addr, out_irq);
res = of_irq_map_raw(p, intspec + index * intsize, intsize,
addr, out_irq);
of_node_put(p);
return res;
}
@@ -965,7 +974,7 @@ int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
laddr[0] = (pdev->bus->number << 16)
| (pdev->devfn << 8);
laddr[1] = laddr[2] = 0;
return of_irq_map_raw(ppnode, &lspec, laddr, out_irq);
return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
}
EXPORT_SYMBOL_GPL(of_irq_map_pci);
#endif /* CONFIG_PCI */