[Patch v4 04/23] ACPI: Use the length check for io resources as well

Jiang Liu
2015-02-05T05:42:31Z

From: Thomas Gleixner <tglx@linutronix.de>

Also apply length check to IO resources.

[Jiang] Remove enforcement that resource starting address must be
non-zero.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
drivers/acpi/resource.c | 44 +++++++++++++++++++-------------------------
1 file changed, 19 insertions(+), 25 deletions(-)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 3e7d9f6eb875..16d291c60277 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -117,31 +117,30 @@ bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);

-static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode,
- bool window)
+static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
+ u8 io_decode, bool window)
{
- int flags = IORESOURCE_IO;
+ res->flags = IORESOURCE_IO;

- if (io_decode == ACPI_DECODE_16)
- flags |= IORESOURCE_IO_16BIT_ADDR;
+ if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
+ res->flags |= IORESOURCE_DISABLED;

- if (start > end || end >= 0x10003)
- flags |= IORESOURCE_DISABLED;
+ if (res->end >= 0x10003)
+ res->flags |= IORESOURCE_DISABLED;

- if (window)
- flags |= IORESOURCE_WINDOW;
+ if (io_decode == ACPI_DECODE_16)
+ res->flags |= IORESOURCE_IO_16BIT_ADDR;

- return flags;
+ if (window)
+ res->flags |= IORESOURCE_WINDOW;
}

static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
u8 io_decode)
{
- u64 end = start + len - 1;
-
res->start = start;
- res->end = end;
- res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false);
+ res->end = start + len - 1;
+ acpi_dev_ioresource_flags(res, len, io_decode, false);
}

/**
@@ -161,16 +160,12 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
switch (ares->type) {
case ACPI_RESOURCE_TYPE_IO:
io = &ares->data.io;
- if (!io->minimum && !io->address_length)
- return false;
acpi_dev_get_ioresource(res, io->minimum,
io->address_length,
io->io_decode);
break;
case ACPI_RESOURCE_TYPE_FIXED_IO:
fixed_io = &ares->data.fixed_io;
- if (!fixed_io->address && !fixed_io->address_length)
- return false;
acpi_dev_get_ioresource(res, fixed_io->address,
fixed_io->address_length,
ACPI_DECODE_10);
@@ -178,7 +173,8 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
default:
return false;
}
- return true;
+
+ return !(res->flags & IORESOURCE_DISABLED);
}
EXPORT_SYMBOL_GPL(acpi_dev_resource_io);

@@ -216,9 +212,8 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
case ACPI_IO_RANGE:
io_decode = addr.address.granularity == 0xfff ?
ACPI_DECODE_10 : ACPI_DECODE_16;
- res->flags = acpi_dev_ioresource_flags(addr.address.minimum,
- addr.address.maximum,
- io_decode, window);
+ acpi_dev_ioresource_flags(res, addr.address.address_length,
+ io_decode, window);
break;
case ACPI_BUS_NUMBER_RANGE:
res->flags = IORESOURCE_BUS;
@@ -266,9 +261,8 @@ bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
case ACPI_IO_RANGE:
io_decode = ext_addr->address.granularity == 0xfff ?
ACPI_DECODE_10 : ACPI_DECODE_16;
- res->flags = acpi_dev_ioresource_flags(ext_addr->address.minimum,
- ext_addr->address.maximum,
- io_decode, window);
+ acpi_dev_ioresource_flags(res, ext_addr->address.address_length,
+ io_decode, window);
break;
case ACPI_BUS_NUMBER_RANGE:
res->flags = IORESOURCE_BUS;
--
1.7.10.4