[REGRESSION BUG] at91 is broken on barebox

[Sascha Hauer]

On Fri, Dec 26, 2014 at 10:51:43AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> HI,
> 
> 	since the switch to ERR_PTR & co
> 
> 	for dev_get_resource_by_name & others the at91 is broken
> 
> 	as on barebox we use a 1:1 mapping and the check of the IS_ERR is
> 	((unsigned long)-MAX_ERRNO)
> 
> 	but on at91 the PIT and so on are at 0xfffffd30 so on always seen as
> 	an error

Damn :(

Since dev_get_resource_by_name returns a struct resource pointer it
shouldn't be broken, right?  What's broken should be:

dev_get_mem_region_by_name
dev_request_mem_region_by_name
dev_request_mem_region

> 
> 	so can we revert the commit on 
> 
> 	ommit 92cc1b1f9e3363046583962859a3a8c054f4b94d

Since these commits touch so many files I'm not sure we can simply
revert these commits. All drivers that check for IS_ERR() from the above
functions that were introduced after the commits to revert would have to
be changed aswell.

The functions should still work, but the error check with IS_ERR() does
not, right? So as a stop gap solution we could drop the error check from
the affected drivers and as the next step change the prototype of the
affected functions to something like:

int dev_request_mem_region(struct device_d *dev, int num, void __iomem **base);

Which drivers are affected anyway?

Sascha

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