From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Peter Hurley <peter@hurleysoftware.com>,
Thierry Reding <thierry.reding@gmail.com>
Cc: Varka Bhadram <varkabhadram@gmail.com>,
Chunyan Zhang <chunyan.zhang@spreadtrum.com>,
gregkh@linuxfoundation.org, mark.rutland@arm.com,
gnomes@lxorguk.ukuu.org.uk, heiko@sntech.de, andrew@lunn.ch,
jslaby@suse.cz, lanqing.liu@spreadtrum.com, pawel.moll@arm.com,
zhang.lyra@gmail.com, zhizhou.zhang@spreadtrum.com,
geng.ren@spreadtrum.com, antonynpavlov@gmail.com,
linux-serial@vger.kernel.org, grant.likely@linaro.org,
orsonzhai@gmail.com, florian.vaussard@epfl.ch,
devicetree@vger.kernel.org, jason@lakedaemon.net, arnd@arndb.de,
ijc+devicetree@hellion.org.uk, hytszk@gmail.com,
robh+dt@kernel.org, wei.qiao@spreadtrum.com,
linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org, galak@codeaurora.org,
shawn.guo@linaro.org
Subject: Re: [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support
Date: Thu, 29 Jan 2015 16:05:53 +0000 [thread overview]
Message-ID: <20150129160553.GC26493@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <54CA568E.6080306@hurleysoftware.com>
On Thu, Jan 29, 2015 at 10:49:34AM -0500, Peter Hurley wrote:
> Hi Varka,
>
> On 01/29/2015 10:26 AM, Varka Bhadram wrote:
> > This check is not required. It will be done by devm_ioremap_resource()
>
> I disagree. devm_ioremap_resource() interprets the NULL resource as
> a bad parameter and returns -EINVAL which is then forwarded as the
> return value from the probe.
>
> -ENODEV is the correct return value from the probe if the expected
> resource is not available (either because it doesn't exist or was already
> claimed by another driver).
(Adding Thierry as the author of this function.)
I believe devm_ioremap_resource() was explicitly designed to remove such
error handling from drivers, and to give drivers a unified error response
to such things as missing resources.
See the comments for this function in lib/devres.c.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
To: Peter Hurley
<peter-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>,
Thierry Reding
<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Varka Bhadram
<varkabhadram-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Chunyan Zhang
<chunyan.zhang-lxIno14LUO0EEoCn2XhGlw@public.gmane.org>,
gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
gnomes-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org,
heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org,
andrew-g2DYL2Zd6BY@public.gmane.org,
jslaby-AlSwsSmVLrQ@public.gmane.org,
lanqing.liu-lxIno14LUO0EEoCn2XhGlw@public.gmane.org,
pawel.moll-5wv7dgnIgG8@public.gmane.org,
zhang.lyra-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
zhizhou.zhang-lxIno14LUO0EEoCn2XhGlw@public.gmane.org,
geng.ren-lxIno14LUO0EEoCn2XhGlw@public.gmane.org,
antonynpavlov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
orsonzhai-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
florian.vaussard-p8DiymsW2f8@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org,
arnd-r2nGTMty4D4@public.gmane.org,
ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org,
hytszk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
wei.qiao-lxIno14LUO0EEoCn2XhGlw@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
Subject: Re: [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support
Date: Thu, 29 Jan 2015 16:05:53 +0000 [thread overview]
Message-ID: <20150129160553.GC26493@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <54CA568E.6080306-WaGBZJeGNqdsbIuE7sb01tBPR1lH4CV8@public.gmane.org>
On Thu, Jan 29, 2015 at 10:49:34AM -0500, Peter Hurley wrote:
> Hi Varka,
>
> On 01/29/2015 10:26 AM, Varka Bhadram wrote:
> > This check is not required. It will be done by devm_ioremap_resource()
>
> I disagree. devm_ioremap_resource() interprets the NULL resource as
> a bad parameter and returns -EINVAL which is then forwarded as the
> return value from the probe.
>
> -ENODEV is the correct return value from the probe if the expected
> resource is not available (either because it doesn't exist or was already
> claimed by another driver).
(Adding Thierry as the author of this function.)
I believe devm_ioremap_resource() was explicitly designed to remove such
error handling from drivers, and to give drivers a unified error response
to such things as missing resources.
See the comments for this function in lib/devres.c.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
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WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support
Date: Thu, 29 Jan 2015 16:05:53 +0000 [thread overview]
Message-ID: <20150129160553.GC26493@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <54CA568E.6080306@hurleysoftware.com>
On Thu, Jan 29, 2015 at 10:49:34AM -0500, Peter Hurley wrote:
> Hi Varka,
>
> On 01/29/2015 10:26 AM, Varka Bhadram wrote:
> > This check is not required. It will be done by devm_ioremap_resource()
>
> I disagree. devm_ioremap_resource() interprets the NULL resource as
> a bad parameter and returns -EINVAL which is then forwarded as the
> return value from the probe.
>
> -ENODEV is the correct return value from the probe if the expected
> resource is not available (either because it doesn't exist or was already
> claimed by another driver).
(Adding Thierry as the author of this function.)
I believe devm_ioremap_resource() was explicitly designed to remove such
error handling from drivers, and to give drivers a unified error response
to such things as missing resources.
See the comments for this function in lib/devres.c.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2015-01-29 16:06 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <sc9836-serial-v10>
2015-01-28 11:08 ` [PATCH v10 0/2] Add Spreadtrum SoC bindings and serial driver support Chunyan Zhang
2015-01-28 11:08 ` Chunyan Zhang
2015-01-28 11:08 ` Chunyan Zhang
2015-01-28 11:08 ` [PATCH v10 1/2] Documentation: DT: Add bindings for Spreadtrum SoC Platform Chunyan Zhang
2015-01-28 11:08 ` Chunyan Zhang
2015-01-28 11:08 ` Chunyan Zhang
2015-01-28 11:08 ` [PATCH v10 2/2] tty/serial: Add Spreadtrum sc9836-uart driver support Chunyan Zhang
2015-01-28 11:08 ` Chunyan Zhang
2015-01-28 11:08 ` Chunyan Zhang
2015-01-29 15:26 ` Varka Bhadram
2015-01-29 15:26 ` Varka Bhadram
2015-01-29 15:32 ` Varka Bhadram
2015-01-29 15:32 ` Varka Bhadram
2015-01-29 15:32 ` Varka Bhadram
2015-01-29 15:49 ` Peter Hurley
2015-01-29 15:49 ` Peter Hurley
2015-01-29 15:49 ` Peter Hurley
2015-01-29 16:04 ` Varka Bhadram
2015-01-29 16:16 ` Peter Hurley
2015-01-29 16:16 ` Peter Hurley
2015-01-29 16:16 ` Peter Hurley
2015-01-29 16:05 ` Russell King - ARM Linux [this message]
2015-01-29 16:05 ` Russell King - ARM Linux
2015-01-29 16:05 ` Russell King - ARM Linux
2015-01-29 16:34 ` Peter Hurley
2015-01-29 16:34 ` Peter Hurley
2015-01-29 16:34 ` Peter Hurley
2015-01-30 10:18 ` Thierry Reding
2015-01-30 10:18 ` Thierry Reding
2015-01-30 10:18 ` Thierry Reding
2015-01-30 12:03 ` Peter Hurley
2015-01-30 12:03 ` Peter Hurley
2015-01-30 12:03 ` Peter Hurley
2015-01-30 14:08 ` Russell King - ARM Linux
2015-01-30 14:08 ` Russell King - ARM Linux
2015-01-30 14:08 ` Russell King - ARM Linux
2015-01-30 15:32 ` Peter Hurley
2015-01-30 15:32 ` Peter Hurley
2015-01-30 15:49 ` Russell King - ARM Linux
2015-01-30 15:49 ` Russell King - ARM Linux
2015-01-30 15:49 ` Russell King - ARM Linux
2015-01-30 15:59 ` Peter Hurley
2015-01-30 15:59 ` Peter Hurley
2015-01-30 15:59 ` Peter Hurley
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