Re: [V2] mtd: devices: docg3:- Handle return value of devm_ioremap.

[Boris Brezillon]

Hi Arvind,

On Mon, 12 Dec 2016 21:33:05 +0530
arvind Yadav <arvind.yadav.cs@xxxxxxxxx> wrote:

> There is problem, if you will use devm_ioremap_resource instead of 
> devm_ioremap,
> than devm_ioremap_resource will call request_mem_region().
> request_mem_region() allows to tell the kernel that this driver is going 
> to use
> this range of I/O addresses, which will prevent other drivers to make an
> overlapping call to request_mem_region If other driver want to use same 
> address
> space to access then it will not allow. Means we can not share same 
> address space
> between two driver.

The question is, is it required here? In general, allowing 2 different
drivers from touching the same iomem region is a bad idea, so, if
there's a reason to allow that here, I'd like to know more about it.

Thanks,

Boris