Re: PCI driver

[Jiri Slaby <jirislaby@gmail.com>]

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@gmail.com      ~\-/~
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