diff options
| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2008-06-27 16:57:12 -0600 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2008-07-16 23:27:07 +0200 |
| commit | fe2cf598e6942abd8fb70fee230d74b1a1eae0d1 (patch) | |
| tree | 9b812788832205f05d2d1cf3bdb654702a7824d0 /drivers | |
| parent | c227536b4cc2600fc9d22ba0067f699165f6621f (diff) | |
| download | lwn-fe2cf598e6942abd8fb70fee230d74b1a1eae0d1.tar.gz lwn-fe2cf598e6942abd8fb70fee230d74b1a1eae0d1.zip | |
PNPACPI: ignore _PRS interrupt numbers larger than PNP_IRQ_NR
ACPI Extended Interrupt Descriptors can encode 32-bit interrupt
numbers, so an interrupt number may exceed the size of the bitmap
we use to track possible IRQ settings.
To avoid corrupting memory, complain and ignore too-large interrupt
numbers.
There's similar code in pnpacpi_parse_irq_option(), but I didn't
change that because the small IRQ descriptor can only encode
IRQs 0-15, which do not exceed bitmap size.
In the future, we could handle IRQ numbers greater than PNP_IRQ_NR
by replacing the bitmap with a table or list.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pnp/pnpacpi/rsparser.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c index 3aaf406b67b8..851c773feae1 100644 --- a/drivers/pnp/pnpacpi/rsparser.c +++ b/drivers/pnp/pnpacpi/rsparser.c @@ -455,9 +455,16 @@ static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev, return; bitmap_zero(map.bits, PNP_IRQ_NR); - for (i = 0; i < p->interrupt_count; i++) - if (p->interrupts[i]) - __set_bit(p->interrupts[i], map.bits); + for (i = 0; i < p->interrupt_count; i++) { + if (p->interrupts[i]) { + if (p->interrupts[i] < PNP_IRQ_NR) + __set_bit(p->interrupts[i], map.bits); + else + dev_err(&dev->dev, "ignoring IRQ %d option " + "(too large for %d entry bitmap)\n", + p->interrupts[i], PNP_IRQ_NR); + } + } flags = irq_flags(p->triggering, p->polarity, p->sharable); pnp_register_irq_resource(dev, option, &map, flags); |