i2c: mark HostNotify target address as used

[ Upstream commit bd9f5348089b65612e5ca976e2ae22f005340331 ]

I2C core handles the local target for receiving HostNotify alerts. There
is no separate driver bound to that address. That means userspace can
access it if desired, leading to further complications if controllers
are not capable of reading their own local target. Bind the local target
to the dummy driver so it will be marked as "handled by the kernel" if
the HostNotify feature is used. That protects aginst userspace access
and prevents other drivers binding to it.

Fixes: 2a71593da34d ("i2c: smbus: add core function handling SMBus host-notify")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 3642d42463209eb0b21487cdcc5480dad7b5abf5..1e873ff0a624d93bbbb8f7e7caa520fed970d71e 100644 (file)
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1064,6 +1064,7 @@ EXPORT_SYMBOL(i2c_find_device_by_fwnode);
 
 static const struct i2c_device_id dummy_id[] = {
        { "dummy", 0 },
+       { "smbus_host_notify", 0 },
        { },
 };