On Fri, Dec 04, 2009 at 01:21:43, Karicheri, Muralidharan wrote:
>
[...]
> >
> >> + if (!res) {
> >> + status = -EBUSY;
> >> + goto fail_nores;
> >> + }
> >> +
> >> + ccdc_base_addr = ioremap_nocache(res->start, res_len);
> >> + if (!ccdc_base_addr) {
> >> + status = -EBUSY;
> >[Hiremath, Vaibhav] Is -EBUSY right return value, I think it should be -
> >ENXIO or -ENOMEM.
> >
> I see -ENXIO & -ENOMEM being used by drivers. -ENXIO stands for "No such device or address". ENOMEM stands for "Out of memory" . Since we are trying to map the address here, -ENXIO looks reasonable to me. Same if request_mem_region() fails.
>
Sergei had posted on this earlier[1]. Quoting him here:
"
> What are the proper error codes when platform_get_resource,
-ENODEV.
> request_mem_region
-EBUSY.
> and ioremap functions fail?.
-ENOMEM.
"
Not sure if ioremap failure can relate to absence of a device.
Thanks,
Sekhar
[1] http://www.mail-archive.com/davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx/msg14973.html
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