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i2c: testunit: discard write requests while old command is running

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[ 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: b39ab96aa8 ("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>
This commit is contained in:
Wolfram Sang
2024-06-27 13:14:48 +02:00
committed by Greg Kroah-Hartman
parent 86826b1ffd
commit 274239d9f8
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/i2c-slave-testunit.c
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@@ -121,6 +121,9 @@ static int i2c_slave_testunit_slave_cb(struct i2c_client *client,
break; break;
case I2C_SLAVE_WRITE_REQUESTED: case I2C_SLAVE_WRITE_REQUESTED:
if (test_bit(TU_FLAG_IN_PROCESS, &tu->flags))
return -EBUSY;
memset(tu->regs, 0, TU_NUM_REGS); memset(tu->regs, 0, TU_NUM_REGS);
tu->reg_idx = 0; tu->reg_idx = 0;
break; break;