From: "Mika Penttilä" <mika.j.penttila@gmail.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, edubezval@gmail.com
Subject:
Date: Tue, 1 Sep 2015 17:14:37 +0300 [thread overview]
Message-ID: <CAChTCPz8_2ddsuBgVF0VX-a7Lp=WHWP+W3nyzQgi+g9Tj2EZvQ@mail.gmail.com> (raw)
This one causes imx6q with debug uart connected to "schedule while
atomic" endlessly :
9e7b399d6528eac33a6fbfceb2b92af209c3454d is the first bad commit
commit 9e7b399d6528eac33a6fbfceb2b92af209c3454d
Author: Eduardo Valentin <edubezval@gmail.com>
Date: Tue Aug 11 10:21:20 2015 -0700
serial: imx: remove unbalanced clk_prepare
The current code attempts to prepare clk_per and clk_ipg
before using the device. However, the result is an extra
prepare call on each clock. Here is the output of uart
clocks (only uart enabled and used as console):
$ grep uart /sys/kernel/debug/clk/clk_summary
uart_serial 1 2 80000000 0 0
uart 1 2 66000000 0 0
This patch balances the calls of prepares. The result is:
$ grep uart /sys/kernel/debug/clk/clk_summary
uart_serial 1 1 80000000 0 0
uart 1 1 66000000 0 0
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
WARNING: multiple messages have this Message-ID (diff)
From: mika.j.penttila@gmail.com (Mika Penttilä)
To: linux-arm-kernel@lists.infradead.org
Subject: No subject
Date: Tue, 1 Sep 2015 17:14:37 +0300 [thread overview]
Message-ID: <CAChTCPz8_2ddsuBgVF0VX-a7Lp=WHWP+W3nyzQgi+g9Tj2EZvQ@mail.gmail.com> (raw)
This one causes imx6q with debug uart connected to "schedule while
atomic" endlessly :
9e7b399d6528eac33a6fbfceb2b92af209c3454d is the first bad commit
commit 9e7b399d6528eac33a6fbfceb2b92af209c3454d
Author: Eduardo Valentin <edubezval@gmail.com>
Date: Tue Aug 11 10:21:20 2015 -0700
serial: imx: remove unbalanced clk_prepare
The current code attempts to prepare clk_per and clk_ipg
before using the device. However, the result is an extra
prepare call on each clock. Here is the output of uart
clocks (only uart enabled and used as console):
$ grep uart /sys/kernel/debug/clk/clk_summary
uart_serial 1 2 80000000 0 0
uart 1 2 66000000 0 0
This patch balances the calls of prepares. The result is:
$ grep uart /sys/kernel/debug/clk/clk_summary
uart_serial 1 1 80000000 0 0
uart 1 1 66000000 0 0
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial at vger.kernel.org
Cc: linux-pm at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
next reply other threads:[~2015-09-01 14:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-01 14:14 Mika Penttilä [this message]
2015-09-01 14:14 ` No subject Mika Penttilä
2015-09-01 15:22 ` Fabio Estevam
2015-09-01 15:22 ` No subject Fabio Estevam
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