From 08bc912fe762acb615372ce71430332aa240399b Mon Sep 17 00:00:00 2001 From: Jarkko Nikula Date: Thu, 15 Aug 2019 16:52:11 +0300 Subject: [PATCH] i2c: designware: Synchronize IRQs when unregistering slave client [ Upstream commit c486dcd2f1bbdd524a1e0149734b79e4ae329650 ] Make sure interrupt handler i2c_dw_irq_handler_slave() has finished before clearing the the dev->slave pointer in i2c_dw_unreg_slave(). There is possibility for a race if i2c_dw_irq_handler_slave() is running on another CPU while clearing the dev->slave pointer. Reported-by: Krzysztof Adamski Reported-by: Wolfram Sang Signed-off-by: Jarkko Nikula Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-designware-slave.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/i2c/busses/i2c-designware-slave.c b/drivers/i2c/busses/i2c-designware-slave.c index ea9578ab19a1..fccf936f4b9b 100644 --- a/drivers/i2c/busses/i2c-designware-slave.c +++ b/drivers/i2c/busses/i2c-designware-slave.c @@ -206,6 +206,7 @@ static int i2c_dw_unreg_slave(struct i2c_client *slave) dev->disable_int(dev); dev->disable(dev); + synchronize_irq(dev->irq); dev->slave = NULL; pm_runtime_put(dev->dev); -- 2.20.1