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staging: comedi: add 'ioenabled' flag to device

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Add 1-bit bit-field member `ioenabled` of type `bool` to `struct
comedi_device`.  Use this to keep track of whether a PCI device and its
BARs have been successfully enabled by `comedi_pci_enable()`.  This
avoids overloading the meaning of the `iobase` member which is used by
several drivers to hold the base port I/O address of a board's "main"
registers.  Other drivers using MMIO use `iobase` as a flag to indicate
that the preceding call to `comedi_pci_enable()` was successful.  They
no longer need to do that.

The name `ioenabled` is intended to be PCI-agnostic so it can be used
for similar purposes by non-PCI drivers.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-03-15 13:15:35 +00:00 committed by Greg Kroah-Hartman
parent 13f12b5aea
commit 00ca688418
3 changed files with 6 additions and 1 deletions
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5
drivers/staging/comedi/comedi_pci.c
View File

@ -55,6 +55,8 @@ int comedi_pci_enable(struct comedi_device *dev)
: dev->driver->driver_name);
if (rc < 0)
pci_disable_device(pcidev);
else
dev->ioenabled = true;
return rc;
}
@ -68,10 +70,11 @@ void comedi_pci_disable(struct comedi_device *dev)
{
struct pci_dev *pcidev = comedi_to_pci_dev(dev);
if (pcidev && dev->iobase) {
if (pcidev && dev->ioenabled) {
pci_release_regions(pcidev);
pci_disable_device(pcidev);
}
dev->ioenabled = false;
}
EXPORT_SYMBOL_GPL(comedi_pci_disable);

1
drivers/staging/comedi/comedidev.h
View File

@ -209,6 +209,7 @@ struct comedi_device {
const void *board_ptr;
bool attached:1;
bool in_request_module:1;
bool ioenabled:1;
spinlock_t spinlock;
struct mutex mutex;

1
drivers/staging/comedi/drivers.c
View File

@ -110,6 +110,7 @@ static void cleanup_device(struct comedi_device *dev)
dev->board_name = NULL;
dev->board_ptr = NULL;
dev->iobase = 0;
dev->ioenabled = false;
dev->irq = 0;
dev->read_subdev = NULL;
dev->write_subdev = NULL;