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PCI: Warn on driver probe return value greater than zero

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Ages ago, drivers could return values greater than zero from their probe
function and this would be regarded as success.

But after f3ec4f87d6 ("PCI: change device runtime PM settings for probe
and remove") and 967577b062 ("PCI/PM: Keep runtime PM enabled for unbound
PCI devices"), we set dev->driver to NULL if the driver's probe function
returns a value greater than zero.

__pci_device_probe() treats this as success, and drivers can still mostly
work even with dev->driver == NULL, but PCI power management doesn't work,
and we don't call the driver's remove function on rmmod.

To help catch these driver problems, issue a warning in this case.

[bhelgaas: changelog]
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Stephen M. Cameron 2013-11-01 14:34:55 -05:00 committed by Bjorn Helgaas
parent fbeeb822f6
commit f92d74c1f5
1 changed files with 10 additions and 2 deletions
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12
drivers/pci/pci-driver.c
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@ -264,11 +264,19 @@ static long local_pci_probe(void *_ddi)
pm_runtime_get_sync(dev);
pci_dev->driver = pci_drv;
rc = pci_drv->probe(pci_dev, ddi->id);
if (rc) {
if (!rc)
return rc;
if (rc < 0) {
pci_dev->driver = NULL;
pm_runtime_put_sync(dev);
return rc;
}
return rc;
/*
* Probe function should return < 0 for failure, 0 for success
* Treat values > 0 as success, but warn.
*/
dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
return 0;
}
static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,