ACPI / resources: ignore invalid ACPI device resources
ACPI table may export resource entry with 0 length. But the current code interprets this kind of resource in a wrong way. It will create a resource structure with res->end = acpi_resource->start + acpi_resource->len - 1; This patch fixes a problem on my machine that a platform device fails to be created because one of its ACPI IO resource entry (start = 0, end = 0, length = 0) is translated into a generic resource with start = 0, end = 0xffffffff. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -77,18 +77,24 @@ bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
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switch (ares->type) {
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case ACPI_RESOURCE_TYPE_MEMORY24:
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memory24 = &ares->data.memory24;
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if (!memory24->address_length)
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return false;
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acpi_dev_get_memresource(res, memory24->minimum,
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memory24->address_length,
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memory24->write_protect);
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break;
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case ACPI_RESOURCE_TYPE_MEMORY32:
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memory32 = &ares->data.memory32;
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if (!memory32->address_length)
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return false;
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acpi_dev_get_memresource(res, memory32->minimum,
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memory32->address_length,
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memory32->write_protect);
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break;
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case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
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fixed_memory32 = &ares->data.fixed_memory32;
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if (!fixed_memory32->address_length)
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return false;
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acpi_dev_get_memresource(res, fixed_memory32->address,
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fixed_memory32->address_length,
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fixed_memory32->write_protect);
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@ -144,12 +150,16 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
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switch (ares->type) {
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case ACPI_RESOURCE_TYPE_IO:
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io = &ares->data.io;
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if (!io->address_length)
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return false;
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acpi_dev_get_ioresource(res, io->minimum,
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io->address_length,
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io->io_decode);
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break;
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case ACPI_RESOURCE_TYPE_FIXED_IO:
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fixed_io = &ares->data.fixed_io;
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if (!fixed_io->address_length)
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return false;
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acpi_dev_get_ioresource(res, fixed_io->address,
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fixed_io->address_length,
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ACPI_DECODE_10);
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