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author | jhb <jhb@FreeBSD.org> | 2011-06-17 21:19:01 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2011-06-17 21:19:01 +0000 |
commit | da75fed86a777fdd59906f79bdb11b005e178948 (patch) | |
tree | 04d7a0619db185683f40ed00e7168df66b9410f5 /lib/libc/stdio/swprintf.c | |
parent | edb18ee3379332d9615a9797e0631bad1fea8abb (diff) | |
download | FreeBSD-src-da75fed86a777fdd59906f79bdb11b005e178948.zip FreeBSD-src-da75fed86a777fdd59906f79bdb11b005e178948.tar.gz |
Don't create a device_t object or parse current resources (via _CRS) for
ACPI Device() objects that do not have any device IDs available via the
_HID or _CID methods. Without a device ID a device driver cannot attach
to the device anyway. Namespace objects that are devices but not of
type ACPI_TYPE_DEVICE are not affected.
A few BIOSes have also attached a _CRS method to a PCI device to
allocate resources that are not managed via a BAR. With the previous
code those resources are allocated from acpi0 directly which can interfere
with the new PCI-PCI bridge driver (since the PCI device in question may
be behind a bridge and its resources should be allocated from that
bridge's windows instead). The resources were also orphaned and
and would end up associated with some other random device whose device_t
reused the pointer of the original ACPI-enumerated device (after it was
free'd by the ACPI PCI bus driver) in devinfo output which was confusing.
If we want to handle _CRS on PCI devices we can adjust the ACPI PCI bus
driver to do that in the future and associate the resources with the
proper device object respecting PCI-PCI bridges, etc.
Note that with this change the ACPI PCI bus driver no longer has to
delete ACPI-enumerated device_t devices that mirror PCI devices since
they should in general not exist. There are rare cases when a BIOS
will give a PCI device a _HID (e.g. I've seen a PCI-ISA bridge given
a _HID for a system resource device). In that case we leave both the
ACPI and PCI-enumerated device_t objects around just as in the previous
code.
Diffstat (limited to 'lib/libc/stdio/swprintf.c')
0 files changed, 0 insertions, 0 deletions