linux-kernel - [PATCH AUTOSEL 4.19 43/52] i2c: designware: Synchronize IRQs when unregistering slave client

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Message-Id: <20190904160004.3671-43-sashal@kernel.org>
Date:   Wed,  4 Sep 2019 11:59:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Krzysztof Adamski <krzysztof.adamski@...ia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sasha Levin <sashal@...nel.org>, linux-i2c@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 43/52] i2c: designware: Synchronize IRQs when unregistering slave client

From: Jarkko Nikula <jarkko.nikula@...ux.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@...ia.com>
Reported-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Sasha Levin <sashal@...nel.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 e7f9305b2dd9f..f5f001738df5e 100644
--- a/drivers/i2c/busses/i2c-designware-slave.c
+++ b/drivers/i2c/busses/i2c-designware-slave.c
@@ -94,6 +94,7 @@ 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