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Don't perform the acpi_DeviceIsPresent() check for PCI-PCI bridges. If

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we are probing a PCI-PCI bridge it is because we found one by enumerating
the devices on a PCI bus, so the bridge is definitely present.  A few
BIOSes report incorrect status (_STA) for some bridges that claimed they
were not present when in fact they were.

While here, move this check earlier for Host-PCI bridges so attach fails
before doing any work that needs to be torn down.

PR:		kern/91594
Tested by:	Jack Vogel @ Intel
MFC after:	1 week
This commit is contained in:
John Baldwin 2013-07-03 17:26:05 +00:00
parent ce300fbfb7
commit 8f4c2e526b
2 changed files with 7 additions and 10 deletions
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9
sys/dev/acpica/acpi_pcib.c
View file

@ -134,15 +134,6 @@ acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/*
* Don't attach if we're not really there.
*
* XXX: This isn't entirely correct since we may be a PCI bus
* on a hot-plug docking station, etc.
*/
if (!acpi_DeviceIsPresent(dev))
return_VALUE(ENXIO);
/*
* Get the PCI interrupt routing table for this bus. If we can't
* get it, this is not an error but may reduce functionality. There

8
sys/dev/acpica/acpi_pcib_acpi.c
View file

@ -286,6 +286,12 @@ acpi_pcib_acpi_attach(device_t dev)
sc->ap_dev = dev;
sc->ap_handle = acpi_get_handle(dev);
/*
* Don't attach if we're not really there.
*/
if (!acpi_DeviceIsPresent(dev))
return (ENXIO);
/*
* Get our segment number by evaluating _SEG.
* It's OK for this to not exist.
@ -353,7 +359,7 @@ acpi_pcib_acpi_attach(device_t dev)
if (status != AE_NOT_FOUND) {
device_printf(dev, "could not evaluate _BBN - %s\n",
AcpiFormatException(status));
return_VALUE (ENXIO);
return (ENXIO);
} else {
/* If it's not found, assume 0. */
sc->ap_bus = 0;