i2c: rcar: avoid race when unregistering slave

[ Upstream commit c7c9e914f9a0478fba4dc6f227cfd69cf84a4063 ]

Due to the lockless design of the driver, it is theoretically possible
to access a NULL pointer, if a slave interrupt was running while we were
unregistering the slave. To make this rock solid, disable the interrupt
for a short time while we are clearing the interrupt_enable register.
This patch is purely based on code inspection. The OOPS is super-hard to
trigger because clearing SAR (the address) makes interrupts even more
unlikely to happen as well. While here, reinit SCR to SDBS because this
bit should always be set according to documentation. There is no effect,
though, because the interface is disabled.

Fixes: 7b814d852af6 ("i2c: rcar: avoid race when unregistering slave client")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 07305304712e190be5c03bdec76e531b51ceccc7..ed0f0681097850cb5836085f18f31980c1655d59 100644 (file)
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -815,12 +815,14 @@ static int rcar_unreg_slave(struct i2c_client *slave)
 
        WARN_ON(!priv->slave);
 
-       /* disable irqs and ensure none is running before clearing ptr */
+       /* ensure no irq is running before clearing ptr */
+       disable_irq(priv->irq);
        rcar_i2c_write(priv, ICSIER, 0);
-       rcar_i2c_write(priv, ICSCR, 0);
+       rcar_i2c_write(priv, ICSSR, 0);
+       enable_irq(priv->irq);
+       rcar_i2c_write(priv, ICSCR, SDBS);
        rcar_i2c_write(priv, ICSAR, 0); /* Gen2: must be 0 if not using slave */
 
-       synchronize_irq(priv->irq);
        priv->slave = NULL;
 
        pm_runtime_put(rcar_i2c_priv_to_dev(priv));