Bjorn Helgaas wrote:
I'm curious about how this works. I disassembled the DSDT from
http://bugzilla.kernel.org/show_bug.cgi?id=4773 (I attached the disassembly
at http://bugzilla.kernel.org/attachment.cgi?id=15448&action=view), and
the _PRT contains "_SB" and "ISA" (no trailing underscores):
Package (0x04)
{
0x000DFFFF,
0x00,
\_SB.PCI0.ISA.LNKA,
0x00
}
But by the time we get to acpi_pci_irq_add_entry(), we've added the
underscores somewhere (see
http://bugzilla.kernel.org/attachment.cgi?id=15423&action=view):
0000:00:0d[A] -> \_SB_.PCI0.ISA_.LNKA
I don't know where this happens, but it certainly confused me, and
it seems like it could lead to other bugs.
ACPI is supposed to add trailing underscore for pad all names to 4 bytes.
So ISA will be padded to ISA_.
Regards,
Alex.
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