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ACPI: acpi_bus_{scan,bus,add}: return -ENODEV if no device was found

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Callers (acpi_memhotplug.c, dock.c and others) check for the return
value of acpi_bus_add() and assume a valid device was returned in
case zero was returned.

Thus return -ENODEV if no device was found in acpi_bus_scan and
propagate this through acpi_bus_add and acpi_bus_start.

Also remove a confusing comment in acpiphp_glue.c, acpi_bus_scan
will and cannot invoke if acpi_bus_add returns no valid device.

Signed-off-by: Thomas Renninger <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Thomas Renninger 2010-01-29 17:48:52 +01:00 • committed by Len Brown
commit 7779688fc3
2 changed files with 19 additions and 11 deletions
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6
drivers/pci/hotplug/acpiphp_glue.c
View file

@ -720,12 +720,6 @@ static int acpiphp_bus_add(struct acpiphp_func *func)
-ret_val);
goto acpiphp_bus_add_out;
}
/*
* try to start anyway. We could have failed to add
* simply because this bus had previously been added
* on another add. Don't bother with the return value
* we just keep going.
*/
ret_val = acpi_bus_start(device);
acpiphp_bus_add_out: