Re: [PATCH 67/90] staging: comedi: dt3000: remove 'phys_addr' fromthe private data

From: Ian Abbott
Date: Thu Jul 19 2012 - 08:07:14 EST

On 2012-07-19 02:58, H Hartley Sweeten wrote:
The 'phys_addr' variable in the private data is simply used as
a flag for the detach function to know that the pci device has
been enabled. Use the 'dev->iobase' variable instead as is more
typical for other comedi pci drivers.

I think dev->iobase is really only meant to hold I/O port addresses, although it is wide enough to hold a 32-bit PCI memory address.

Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/staging/comedi/drivers/dt3000.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/comedi/drivers/dt3000.c b/drivers/staging/comedi/drivers/dt3000.c
index 92558e7..3937e87 100644
--- a/drivers/staging/comedi/drivers/dt3000.c
+++ b/drivers/staging/comedi/drivers/dt3000.c
@@ -250,7 +250,6 @@ static const struct dt3k_boardtype dt3k_boardtypes[] = {
struct dt3k_private {

struct pci_dev *pci_dev;
- resource_size_t phys_addr;
void __iomem *io_addr;
unsigned int lock;
unsigned int ao_readback[2];
@@ -824,8 +823,8 @@ static int dt3000_attach(struct comedi_device *dev, struct comedi_devconfig *it)
if (ret < 0)
return ret;

- devpriv->phys_addr = pci_resource_start(pcidev, 0);
- devpriv->io_addr = ioremap(devpriv->phys_addr, DT3000_SIZE);
+ dev->iobase = pci_resource_start(pcidev, 0);
+ devpriv->io_addr = ioremap(dev->iobase, DT3000_SIZE);

dev->iobase is an unsigned long, which may be narrower than a resource_size_t. You should really pass the full-width resource_size_t value to ioremap().

You could even set dev->iobase to some dummy non-zero value as a flag for the detach() routine to call comedi_pci_disable() as dev->iobase is not used for anything else.

if (!devpriv->io_addr)
return -ENOMEM;

@@ -905,7 +904,7 @@ static void dt3000_detach(struct comedi_device *dev)
free_irq(dev->irq, dev);
if (devpriv) {
if (devpriv->pci_dev) {
- if (devpriv->phys_addr)
+ if (dev->iobase)

-=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=-
-=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
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