commit: cadf84bfeb80e216fde328d357fe856160157d2c From: Ian Abbott <[email protected]> Date: Mon, 3 Sep 2012 16:39:38 +0100 Subject: staging: comedi: amplc_pci224: Fix PCI ref count
When attaching a PCI device manually via the comedi driver `attach` hook (`pci224_attach()`) (called by the comedi core for the `COMEDI_DEVCONFIG` ioctl), its reference count is incremented in the `for_each_pci_dev` loop (in `pci224_find_pci_dev()`). It is decremented when the `detach` hook (`pci224_detach()`) is called to detach the device. However, when the PCI device is attached automatically via the `attach_pci` hook (`pci224_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 `pci224_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. Cc: stable <[email protected]> # 3.5.x Signed-off-by: Ian Abbott <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/staging/comedi/drivers/amplc_pci224.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/staging/comedi/drivers/amplc_pci224.c b/drivers/staging/comedi/drivers/amplc_pci224.c index 4e17f13..8bf109e 100644 --- a/drivers/staging/comedi/drivers/amplc_pci224.c +++ b/drivers/staging/comedi/drivers/amplc_pci224.c @@ -1503,6 +1503,13 @@ pci224_attach_pci(struct comedi_device *dev, struct pci_dev *pci_dev) DRIVER_NAME ": BUG! cannot determine board type!\n"); return -EINVAL; } + /* + * Need to 'get' the PCI device to match the 'put' in pci224_detach(). + * TODO: Remove the pci_dev_get() and matching pci_dev_put() once + * support for manual attachment of PCI devices via pci224_attach() + * has been removed. + */ + pci_dev_get(pci_dev); return pci224_attach_common(dev, pci_dev, NULL); } -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
