Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 28/36] i2c: designware: Synchronize IRQs when unregistering slave client | Date | Wed, 4 Sep 2019 12:01:14 -0400 |
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From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
[ 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 <krzysztof.adamski@nokia.com> Reported-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 ea9578ab19a15..fccf936f4b9b5 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
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