linux-kernel - Re: [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support

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Date:	Fri, 30 Jan 2015 15:49:26 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Varka Bhadram <varkabhadram@...il.com>,
	Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
	gregkh@...uxfoundation.org, mark.rutland@....com,
	gnomes@...rguk.ukuu.org.uk, heiko@...ech.de, andrew@...n.ch,
	jslaby@...e.cz, lanqing.liu@...eadtrum.com, pawel.moll@....com,
	zhang.lyra@...il.com, zhizhou.zhang@...eadtrum.com,
	geng.ren@...eadtrum.com, antonynpavlov@...il.com,
	linux-serial@...r.kernel.org, grant.likely@...aro.org,
	orsonzhai@...il.com, florian.vaussard@...l.ch,
	devicetree@...r.kernel.org, jason@...edaemon.net, arnd@...db.de,
	ijc+devicetree@...lion.org.uk, hytszk@...il.com,
	robh+dt@...nel.org, wei.qiao@...eadtrum.com,
	linux-arm-kernel@...ts.infradead.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, galak@...eaurora.org,
	shawn.guo@...aro.org
Subject: Re: [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver
 support

On Fri, Jan 30, 2015 at 10:32:54AM -0500, Peter Hurley wrote:
> Before you say consistency, I think you should look at the stats below.
> IOW, if you want to change the error code return from probe() for
> consistency's sake, a tree-wide patch would be the appropriate way.

Now look outside the serial driver sub-tree.

There are 1234 instances of platform_get_resource(, IORESOURCE_MEM, ) in
the drivers/ sub-tree, with 700 instances of devm_ioremap_resource()
being used there.  Of the devm_ioremap_resource() instances:

- 555 use platform_get_resource() in the preceding two lines - which is
  not enough to do anything but rely on the -EINVAL return value.
- 16 mention ENODEV in the preceding three lines.

There are 132 which use platform_get_resource() and return ENODEV within
the following three lines (which may intersect with the above 16 number)
and 88 which use EINVAL.

So, there are in total 643 instances where a missing resource returns
EINVAL, and between 132 and 148 instances which return ENODEV.

Yes, 643 + 148 isn't 1234, but I'm not going to read through all 1234
locations just for the sake of this thread.   What's clear though is that
more than 50% of sites using platform_get_resource(, IORESOURCE_MEM, )
return EINVAL for the lack of a resource.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
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