linux-kernel - Re: [V2] mtd: devices: docg3:- Handle return value of devm

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Message-ID: <20161212180021.3791c986@bbrezillon>
Date:   Mon, 12 Dec 2016 18:00:21 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:     arvind Yadav <arvind.yadav.cs@...il.com>, dwmw2@...radead.org,
        computersforpeace@...il.com, marek.vasut@...il.com, richard@....at,
        cyrille.pitchen@...el.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [V2] mtd: devices: docg3:- Handle return value of devm_ioremap.

On Mon, 12 Dec 2016 17:32:58 +0100
Robert Jarzmik <robert.jarzmik@...e.fr> wrote:

> arvind Yadav <arvind.yadav.cs@...il.com> writes:
> 
> > 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.  
> 
> Hi,
> 
> You're right Arvind, and still, it's worth noticing that the docg3 access
> semantics imply a "reserved" resource path (see how doc_register_readb() does a
> write and how this cannot be shared with another driver).
> 
> Therefore I'll be willing to ack a mix of your both patches, the
> devm_ioremap_resource() from Boris and the error message from your patch.

devm_ioremap_resource() already prints different error messages
depending on the error type [1], no need to duplicate it.

[1]http://lxr.free-electrons.com/source/lib/devres.c#L134