staging: comedi: dt3000: ioremap'ed addresses are resource_size_t

As mentioned by Ian Abbott, the pci address passed to ioremap
should be a resource_size_t not an unsigned long. Use a local
variable of that type to hold the pci_resource_start() that is
passed to ioremp().

Set the dev->iobase to a dummy non-zero value so that the "detach"
can use it as a flag to know that comedi_pci_disable() needs to
be called.

Reported-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/staging/comedi/drivers/dt3000.c b/drivers/staging/comedi/drivers/dt3000.c
index a6fe6c9be87..3476cda0fff 100644
--- a/drivers/staging/comedi/drivers/dt3000.c
+++ b/drivers/staging/comedi/drivers/dt3000.c
@@ -804,6 +804,7 @@ static int dt3000_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
         struct pci_dev *pcidev;
         struct comedi_subdevice *s;
+        resource_size_t pci_base;
         int ret = 0;
 
         dev_dbg(dev->class_dev, "dt3000:\n");
@@ -820,9 +821,10 @@ static int dt3000_attach(struct comedi_device *dev, struct comedi_devconfig *it)
         ret = comedi_pci_enable(pcidev, "dt3000");
         if (ret < 0)
                 return ret;
+        dev->iobase = 1;        /* the "detach" needs this */
 
-        dev->iobase = pci_resource_start(pcidev, 0);
-        devpriv->io_addr = ioremap(dev->iobase, DT3000_SIZE);
+        pci_base  = pci_resource_start(pcidev, 0);
+        devpriv->io_addr = ioremap(pci_base, DT3000_SIZE);
         if (!devpriv->io_addr)
                 return -ENOMEM;