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commit4d95987a32upstream. Since IRQs might be muxed on some parts, we need to pay attention when we are freeing them. Otherwise we get the ugly WARNING "Trying to free already-free IRQ 20". Fixes:628c534ae7("serial: sh-sci: Improve support for separate TEI and DRI interrupts") Cc: stable <stable@vger.kernel.org> Signed-off-by: Chris Brandt <chris.brandt@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>