Re: PCI driver

[Jiri Slaby]

Manu Abraham napsal(a):
> Jiri Slaby wrote:
>
> > Manu Abraham napsal(a):
> >
> > > Jiri Slaby wrote:
> > >
> > > > you do NOT do this at all, because you have pdev already (the param 
> > > > of the probe function)
> > >
> > > I rewrote the entire thing like this including the pci_remove 
> > > function too, but now it so seems that in the remove function, 
> > > pci_get_drvdata(pdev) returns NULL, and hence i get an Oops at module 
> > > removal.
> >
> >
> > Maybe because this is badly written driver.
>
>
> I have not written the driver, but this is my first go at it ..
>
> > > static int mantis_pci_probe(struct pci_dev *pdev, const struct 
> > > pci_device_id *mantis_pci_table)
> > > {
> > >     struct mantis_pci *mantis;
> > >     struct mantis_eeprom eeprom;
> > >     u8 revision, latency;
> > >     u8 data[2];      if (pci_enable_device(pdev)) {               
> > > dprintk(verbose, MANTIS_DEBUG, 1, "Found a mantis chip");
> > >         if ((mantis = (struct mantis_pci *) kmalloc(sizeof (struct 
> > > mantis_pci), GFP_KERNEL)) == NULL) {
> > >             dprintk(verbose, MANTIS_ERROR, 1, "Out of memory");
> > >             return -ENOMEM;
> > >         }
> > >         pci_set_master(pdev);
> > >         mantis->mantis_addr = pci_resource_start(pdev, 0);
> > >         if (!request_mem_region(pci_resource_start(pdev, 0),
> > >             pci_resource_len(pdev, 0), DRIVER_NAME)) {
> > >             kfree(mantis);
> > >             return -EBUSY;
> > >         }
> > >         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
> > >         pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency);
> > >         mantis->mantis_mmio = ioremap(mantis->mantis_addr, 0x1000);
> > >         pci_set_drvdata(pdev, mantis);       
> >
> >
> > if pci_enable_device fails, you set this?? Maybe you haven't read the 
> > doc enough.
>
>
>
> I just found that, pci_enable_device() fails. So what's the way to go 
> ahead ?
JESUS.
int retval = 0;

if ((retval = pci_enable_device()))
	goto end;

...
pci_set_drvdata(pdev, mantis);
...

end:
	return retval;

not
if (pci_enable_device())
	do something
--
Jiri Slaby         www.fi.muni.cz/~xslaby
~\-/~      jirislaby@xxxxxxxxx      ~\-/~
241B347EC88228DE51EE A49C4A73A25004CB2A10
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