5.15-stable review patch. If anyone has any objections, please let me know.
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From: Wolfram Sang wsa+renesas@sang-engineering.com
[ Upstream commit c116deafd1a5cc1e9739099eb32114e90623209c ]
When clearing registers on new write requests was added, the protection for currently running commands was missed leading to concurrent access to the testunit registers. Check the flag beforehand.
Fixes: b39ab96aa894 ("i2c: testunit: add support for block process calls") Signed-off-by: Wolfram Sang wsa+renesas@sang-engineering.com Reviewed-by: Andi Shyti andi.shyti@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/i2c/i2c-slave-testunit.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/i2c/i2c-slave-testunit.c b/drivers/i2c/i2c-slave-testunit.c index 1beae30c418b8..cd0d87b089fec 100644 --- a/drivers/i2c/i2c-slave-testunit.c +++ b/drivers/i2c/i2c-slave-testunit.c @@ -121,6 +121,9 @@ static int i2c_slave_testunit_slave_cb(struct i2c_client *client, break;
case I2C_SLAVE_WRITE_REQUESTED: + if (test_bit(TU_FLAG_IN_PROCESS, &tu->flags)) + return -EBUSY; + memset(tu->regs, 0, TU_NUM_REGS); tu->reg_idx = 0; break;