[no subject]

From: Mika PenttilÃ
Date: Tue Sep 01 2015 - 10:14:42 EST

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@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxxx>
Cc: linux-serial@xxxxxxxxxxxxxxx
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Eduardo Valentin <edubezval@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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