aboutsummaryrefslogtreecommitdiff
path: root/drivers/pnp/pnpacpi/rsparser.c
diff options
context:
space:
mode:
authorBjorn Helgaas <bjorn.helgaas@hp.com>2010-03-25 10:32:49 -0600
committerLen Brown <len.brown@intel.com>2010-04-04 01:33:43 -0400
commit3162b6f0c5e1fcad372d64194fb3cb968941b428 (patch)
tree31cde2251d3fc28c4e77c8dd213bca0a5a2fedfd /drivers/pnp/pnpacpi/rsparser.c
parent2eaa9cfdf33b8d7fb7aff27792192e0019ae8fc6 (diff)
downloadlinux-linaro-stable-3162b6f0c5e1fcad372d64194fb3cb968941b428.tar.gz
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/rsparser.c')
-rw-r--r--drivers/pnp/pnpacpi/rsparser.c42
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,