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serial: pxa: Do not tweak clock in pxa serial write() function
The write() function could be used by printk(), which is atomic and tweaking clock there can cause "BUG: sleeping function called from invalid context". Signed-off-by: Bao Haojun <hjbao@marvell.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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