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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>
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(none) Mika Penttilä <mika.j.penttila@gmail.com> - 2015-09-01 16:20 +0200
  Re: Fabio Estevam <festevam@gmail.com> - 2015-09-01 17:30 +0200

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