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PCI: Multiprobe sanitizer

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There are numerous drivers that can use multithreaded probing but having
some kind of global flag as the way to control this makes migration to
threaded probing hard and since it enables it everywhere and is almost
as likely to cause serious pain as holding a clog dance in a minefield.

If we have a pci_driver multithread_probe flag to inherit you can turn
it on for one driver at a time.

From playing so far however I think we need a different model at the
device layer which serializes until the called probe function says "ok
you can start another one now". That would need some kind of flag and
semaphore plus a helper function.

Anyway in the absence of that this is a starting point to usefully play
with this stuff

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2006-08-16 17:42:18 +01:00 committed by Greg Kroah-Hartman
parent b19441af18
commit 50b0075520
2 changed files with 7 additions and 1 deletions
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6
drivers/pci/pci-driver.c
View file

@ -421,7 +421,11 @@ int __pci_register_driver(struct pci_driver *drv, struct module *owner)
drv->driver.bus = &pci_bus_type;
drv->driver.owner = owner;
drv->driver.kobj.ktype = &pci_driver_kobj_type;
drv->driver.multithread_probe = pci_multithread_probe;
if (pci_multithread_probe)
drv->driver.multithread_probe = pci_multithread_probe;
else
drv->driver.multithread_probe = drv->multithread_probe;
spin_lock_init(&drv->dynids.lock);
INIT_LIST_HEAD(&drv->dynids.list);

2
include/linux/pci.h
View file

@ -356,6 +356,8 @@ struct pci_driver {
struct pci_error_handlers *err_handler;
struct device_driver driver;
struct pci_dynids dynids;
int multithread_probe;
};
#define to_pci_driver(drv) container_of(drv,struct pci_driver, driver)