diff options
| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2010-03-25 10:32:49 -0600 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2010-04-04 01:33:43 -0400 |
| commit | 3162b6f0c5e1fcad372d64194fb3cb968941b428 (patch) | |
| tree | 31cde2251d3fc28c4e77c8dd213bca0a5a2fedfd /drivers/pnp/pnpacpi | |
| parent | 2eaa9cfdf33b8d7fb7aff27792192e0019ae8fc6 (diff) | |
| download | linux-3162b6f0c5e1fcad372d64194fb3cb968941b428.tar.bz2 | |
PNPACPI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
The ACPI spec (sec 6.4.3.5 in v4.0) requires that for Address Space Resource
Descriptors, _LEN <= _MAX - _MIN + 1 in all cases, but there are BIOSes that
violate this. We experimentally determined that Windows truncates the
resource so it doesn't extend past _MAX, so let's do the same thing in
Linux.
http://bugzilla.kernel.org/show_bug.cgi?id=15480
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/pnp/pnpacpi')
| -rw-r--r-- | drivers/pnp/pnpacpi/rsparser.c | 42 |
1 files changed, 30 insertions, 12 deletions
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c index 54514aa35b09..fe5bfa998f59 100644 --- a/drivers/pnp/pnpacpi/rsparser.c +++ b/drivers/pnp/pnpacpi/rsparser.c @@ -273,12 +273,33 @@ static void pnpacpi_parse_allocated_busresource(struct pnp_dev *dev, pnp_add_bus_resource(dev, start, end); } +static u64 addr_space_length(struct pnp_dev *dev, u64 min, u64 max, u64 len) +{ + u64 max_len; + + max_len = max - min + 1; + if (len <= max_len) + return len; + + /* + * Per 6.4.3.5, _LEN cannot exceed _MAX - _MIN + 1, but some BIOSes + * don't do this correctly, e.g., + * https://bugzilla.kernel.org/show_bug.cgi?id=15480 + */ + dev_info(&dev->dev, + "resource length %#llx doesn't fit in %#llx-%#llx, trimming\n", + (unsigned long long) len, (unsigned long long) min, + (unsigned long long) max); + return max_len; +} + static void pnpacpi_parse_allocated_address_space(struct pnp_dev *dev, struct acpi_resource *res) { struct acpi_resource_address64 addr, *p = &addr; acpi_status status; int window; + u64 len; status = acpi_resource_to_address64(res, p); if (!ACPI_SUCCESS(status)) { @@ -287,20 +308,18 @@ static void pnpacpi_parse_allocated_address_space(struct pnp_dev *dev, return; } + len = addr_space_length(dev, p->minimum, p->maximum, p->address_length); window = (p->producer_consumer == ACPI_PRODUCER) ? 1 : 0; if (p->resource_type == ACPI_MEMORY_RANGE) - pnpacpi_parse_allocated_memresource(dev, - p->minimum, p->address_length, + pnpacpi_parse_allocated_memresource(dev, p->minimum, len, p->info.mem.write_protect, window); else if (p->resource_type == ACPI_IO_RANGE) - pnpacpi_parse_allocated_ioresource(dev, - p->minimum, p->address_length, + pnpacpi_parse_allocated_ioresource(dev, p->minimum, len, p->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16, window); else if (p->resource_type == ACPI_BUS_NUMBER_RANGE) - pnpacpi_parse_allocated_busresource(dev, p->minimum, - p->address_length); + pnpacpi_parse_allocated_busresource(dev, p->minimum, len); } static void pnpacpi_parse_allocated_ext_address_space(struct pnp_dev *dev, @@ -308,21 +327,20 @@ static void pnpacpi_parse_allocated_ext_address_space(struct pnp_dev *dev, { struct acpi_resource_extended_address64 *p = &res->data.ext_address64; int window; + u64 len; + len = addr_space_length(dev, p->minimum, p->maximum, p->address_length); window = (p->producer_consumer == ACPI_PRODUCER) ? 1 : 0; if (p->resource_type == ACPI_MEMORY_RANGE) - pnpacpi_parse_allocated_memresource(dev, - p->minimum, p->address_length, + pnpacpi_parse_allocated_memresource(dev, p->minimum, len, p->info.mem.write_protect, window); else if (p->resource_type == ACPI_IO_RANGE) - pnpacpi_parse_allocated_ioresource(dev, - p->minimum, p->address_length, + pnpacpi_parse_allocated_ioresource(dev, p->minimum, len, p->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16, window); else if (p->resource_type == ACPI_BUS_NUMBER_RANGE) - pnpacpi_parse_allocated_busresource(dev, p->minimum, - p->address_length); + pnpacpi_parse_allocated_busresource(dev, p->minimum, len); } static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res, |