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jz4740-battery: Protect against concurrent battery readings
authorLars-Peter Clausen <lars@metafoo.de>
Thu, 11 Nov 2010 18:00:52 +0000 (19:00 +0100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 17 Feb 2011 23:14:25 +0000 (15:14 -0800)
commit 8ec98fe0b4ffdedce4c1caa9fb3d550f52ad1c6b upstream.

We can not handle more then one ADC request at a time to the battery.
The patch adds a mutex around the ADC read code to ensure this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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