From: Stephen Boyd <sboyd@codeaurora.org>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] clk: let clk_disable() return immediately if clk is NULL or error
Date: Fri, 08 Apr 2016 00:33:28 +0000 [thread overview]
Message-ID: <20160408003328.GA14441@codeaurora.org> (raw)
In-Reply-To: <1459821083-28116-1-git-send-email-yamada.masahiro@socionext.com>
On 04/05, Masahiro Yamada wrote:
> The clk_disable() in the common clock framework (drivers/clk/clk.c)
> returns immediately if a given clk is NULL or an error pointer. It
> allows clock consumers to call clk_disable() without IS_ERR_OR_NULL
> checking if drivers are only used with the common clock framework.
>
> Unfortunately, NULL/error checking is missing from some of non-common
> clk_disable() implementations. This prevents us from completely
> dropping NULL/error checking from callers. Let's make it tree-wide
> consistent by adding IS_ERR_OR_NULL(clk) to all callees.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> Acked-by: Greg Ungerer <gerg@uclinux.org>
> Acked-by: Wan Zongshun <mcuos.com@gmail.com>
> ---
>
> Stephen,
>
> This patch has been unapplied for a long time.
>
> Please let me know if there is something wrong with this patch.
>
I'm mostly confused why we wouldn't want to encourage people to
call clk_disable or unprepare on a clk that's an error pointer.
Typically an error pointer should be dealt with, instead of
silently ignored, so why wasn't it dealt with by passing it up
the probe() path?
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <sboyd@codeaurora.org>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-clk@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
Michael Turquette <mturquette@baylibre.com>,
linux-mips@linux-mips.org, linux-sh@vger.kernel.org,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Eric Miao <eric.y.miao@gmail.com>,
Hartley Sweeten <hsweeten@visionengravers.com>,
Greg Ungerer <gerg@uclinux.org>, Ryan Mallon <rmallon@gmail.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Steven Miao <realmz6@gmail.com>,
Simon Horman <horms@verge.net.au>,
Wan ZongShun <mcuos.com@gmail.com>, Rich Felker <dalias@libc.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
adi-buildroot-devel@lists.sourceforge.net,
Russell King <linux@arm.linux.org.uk>,
linux-m68k@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Magnus Damm <magnus.damm@gmail.com>,
John Crispin <blogic@openwrt.org>
Subject: Re: [PATCH v2] clk: let clk_disable() return immediately if clk is NULL or error
Date: Thu, 7 Apr 2016 17:33:28 -0700 [thread overview]
Message-ID: <20160408003328.GA14441@codeaurora.org> (raw)
In-Reply-To: <1459821083-28116-1-git-send-email-yamada.masahiro@socionext.com>
On 04/05, Masahiro Yamada wrote:
> The clk_disable() in the common clock framework (drivers/clk/clk.c)
> returns immediately if a given clk is NULL or an error pointer. It
> allows clock consumers to call clk_disable() without IS_ERR_OR_NULL
> checking if drivers are only used with the common clock framework.
>
> Unfortunately, NULL/error checking is missing from some of non-common
> clk_disable() implementations. This prevents us from completely
> dropping NULL/error checking from callers. Let's make it tree-wide
> consistent by adding IS_ERR_OR_NULL(clk) to all callees.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> Acked-by: Greg Ungerer <gerg@uclinux.org>
> Acked-by: Wan Zongshun <mcuos.com@gmail.com>
> ---
>
> Stephen,
>
> This patch has been unapplied for a long time.
>
> Please let me know if there is something wrong with this patch.
>
I'm mostly confused why we wouldn't want to encourage people to
call clk_disable or unprepare on a clk that's an error pointer.
Typically an error pointer should be dealt with, instead of
silently ignored, so why wasn't it dealt with by passing it up
the probe() path?
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <sboyd@codeaurora.org>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-clk@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
Michael Turquette <mturquette@baylibre.com>,
linux-mips@linux-mips.org, linux-sh@vger.kernel.org,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Eric Miao <eric.y.miao@gmail.com>,
Hartley Sweeten <hsweeten@visionengravers.com>,
Greg Ungerer <gerg@uclinux.org>, Ryan Mallon <rmallon@gmail.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Steven Miao <realmz6@gmail.com>,
Simon Horman <horms@verge.net.au>,
Wan ZongShun <mcuos.com@gmail.com>, Rich Felker <dalias@libc.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
adi-buildroot-devel@lists.sourceforge.net,
Russell King <linux@arm.linux.org.uk>,
linux-m68k@lists.linux-m68k.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Magnus Damm <magnus.damm@gmail.com>,
John Crispin <blogic@openwrt.org>
Subject: Re: [PATCH v2] clk: let clk_disable() return immediately if clk is NULL or error
Date: Thu, 7 Apr 2016 17:33:28 -0700 [thread overview]
Message-ID: <20160408003328.GA14441@codeaurora.org> (raw)
In-Reply-To: <1459821083-28116-1-git-send-email-yamada.masahiro@socionext.com>
On 04/05, Masahiro Yamada wrote:
> The clk_disable() in the common clock framework (drivers/clk/clk.c)
> returns immediately if a given clk is NULL or an error pointer. It
> allows clock consumers to call clk_disable() without IS_ERR_OR_NULL
> checking if drivers are only used with the common clock framework.
>
> Unfortunately, NULL/error checking is missing from some of non-common
> clk_disable() implementations. This prevents us from completely
> dropping NULL/error checking from callers. Let's make it tree-wide
> consistent by adding IS_ERR_OR_NULL(clk) to all callees.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> Acked-by: Greg Ungerer <gerg@uclinux.org>
> Acked-by: Wan Zongshun <mcuos.com@gmail.com>
> ---
>
> Stephen,
>
> This patch has been unapplied for a long time.
>
> Please let me know if there is something wrong with this patch.
>
I'm mostly confused why we wouldn't want to encourage people to
call clk_disable or unprepare on a clk that's an error pointer.
Typically an error pointer should be dealt with, instead of
silently ignored, so why wasn't it dealt with by passing it up
the probe() path?
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: sboyd@codeaurora.org (Stephen Boyd)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] clk: let clk_disable() return immediately if clk is NULL or error
Date: Thu, 7 Apr 2016 17:33:28 -0700 [thread overview]
Message-ID: <20160408003328.GA14441@codeaurora.org> (raw)
In-Reply-To: <1459821083-28116-1-git-send-email-yamada.masahiro@socionext.com>
On 04/05, Masahiro Yamada wrote:
> The clk_disable() in the common clock framework (drivers/clk/clk.c)
> returns immediately if a given clk is NULL or an error pointer. It
> allows clock consumers to call clk_disable() without IS_ERR_OR_NULL
> checking if drivers are only used with the common clock framework.
>
> Unfortunately, NULL/error checking is missing from some of non-common
> clk_disable() implementations. This prevents us from completely
> dropping NULL/error checking from callers. Let's make it tree-wide
> consistent by adding IS_ERR_OR_NULL(clk) to all callees.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> Acked-by: Greg Ungerer <gerg@uclinux.org>
> Acked-by: Wan Zongshun <mcuos.com@gmail.com>
> ---
>
> Stephen,
>
> This patch has been unapplied for a long time.
>
> Please let me know if there is something wrong with this patch.
>
I'm mostly confused why we wouldn't want to encourage people to
call clk_disable or unprepare on a clk that's an error pointer.
Typically an error pointer should be dealt with, instead of
silently ignored, so why wasn't it dealt with by passing it up
the probe() path?
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2016-04-08 0:33 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-05 1:51 [PATCH v2] clk: let clk_disable() return immediately if clk is NULL or error Masahiro Yamada
2016-04-05 1:51 ` Masahiro Yamada
2016-04-05 1:51 ` Masahiro Yamada
2016-04-05 1:51 ` Masahiro Yamada
2016-04-08 0:33 ` Stephen Boyd [this message]
2016-04-08 0:33 ` Stephen Boyd
2016-04-08 0:33 ` Stephen Boyd
2016-04-08 0:33 ` Stephen Boyd
2016-04-08 1:52 ` Masahiro Yamada
2016-04-08 1:52 ` Masahiro Yamada
2016-04-08 1:52 ` Masahiro Yamada
2016-04-08 1:52 ` Masahiro Yamada
2016-04-08 1:52 ` Masahiro Yamada
2016-04-14 0:33 ` Stephen Boyd
2016-04-14 0:33 ` Stephen Boyd
2016-04-14 0:33 ` Stephen Boyd
2016-04-14 0:33 ` Stephen Boyd
2016-04-14 0:33 ` Stephen Boyd
2016-04-14 1:49 ` Masahiro Yamada
2016-04-14 1:49 ` Masahiro Yamada
2016-04-14 1:49 ` Masahiro Yamada
2016-04-14 1:49 ` Masahiro Yamada
2016-04-16 0:04 ` Stephen Boyd
2016-04-16 0:04 ` Stephen Boyd
2016-04-16 0:04 ` Stephen Boyd
2016-04-16 0:04 ` Stephen Boyd
2016-04-16 0:04 ` Stephen Boyd
2016-04-14 1:49 ` Masahiro Yamada
2016-04-08 10:06 ` Ralf Baechle
2016-04-08 10:06 ` Ralf Baechle
2016-04-08 10:06 ` Ralf Baechle
2016-04-08 10:06 ` Ralf Baechle
2016-04-08 11:15 ` Masahiro Yamada
2016-04-08 11:15 ` Masahiro Yamada
2016-04-08 11:15 ` Masahiro Yamada
2016-04-08 11:15 ` Masahiro Yamada
2016-04-14 0:40 ` Stephen Boyd
2016-04-14 0:40 ` Stephen Boyd
2016-04-14 0:40 ` Stephen Boyd
2016-04-14 0:40 ` Stephen Boyd
2016-04-08 0:33 ` Stephen Boyd
2016-04-05 1:51 Masahiro Yamada
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