[PATCH 2/6] staging: comedi: amplc_dio200: Fix PCI ref count
Ian Abbott
abbotti at mev.co.uk
Mon Sep 3 15:39:39 UTC 2012
When attaching a PCI device manually via the comedi driver `attach` hook
(`dio200_attach()`) (called by the comedi core for the
`COMEDI_DEVCONFIG` ioctl), its reference count is incremented in the
`for_each_pci_dev` loop (in `dio200_find_pci_dev()`). It is decremented
when the `detach` hook (`dio200_detach()`) is called to detach the
device. However, when the PCI device is attached automatically via the
`attach_pci` hook (`dio200_attach_pci()`, called at probe time via
`comedi_pci_auto_config()`) it's reference count is not incremented so
there will be an unmatched decrement when detaching the device.
Increment the PCI device reference count in `dio200_attach_pci()` to
correct the mismatch.
Once support for manual configuration has been removed from this driver,
the calls to `pci_dev_get()` and `pci_dev_put()` can be removed.
Signed-off-by: Ian Abbott <abbotti at mev.co.uk>
---
drivers/staging/comedi/drivers/amplc_dio200.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/staging/comedi/drivers/amplc_dio200.c b/drivers/staging/comedi/drivers/amplc_dio200.c
index 9c8fbf1..5858892 100644
--- a/drivers/staging/comedi/drivers/amplc_dio200.c
+++ b/drivers/staging/comedi/drivers/amplc_dio200.c
@@ -1421,6 +1421,13 @@ static int __devinit dio200_attach_pci(struct comedi_device *dev,
dev_err(dev->class_dev, "BUG! cannot determine board type!\n");
return -EINVAL;
}
+ /*
+ * Need to 'get' the PCI device to match the 'put' in dio200_detach().
+ * TODO: Remove the pci_dev_get() and matching pci_dev_put() once
+ * support for manual attachment of PCI devices via dio200_attach()
+ * has been removed.
+ */
+ pci_dev_get(pci_dev);
return dio200_pci_common_attach(dev, pci_dev);
}
--
1.7.12
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