thunderbolt: Unwind TMU configuration if tb_switch_set_tmu_mode_params() fails

Dan reported that the kernel test robot found an issue with the TMU code
namely in tb_switch_tmu_change_mode() where we should actually go back
to the previous mode in case of failure instead of just returning back
the error. Fix this by unwinding the configuration as we do with the
other error paths in this function.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202311030814.AXtCk7PO-lkp@intel.com/
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/thunderbolt/tmu.c b/drivers/thunderbolt/tmu.c
index 11f2aec2a5d374ede2c87215a184284009dc8e9e..9a259c72e5a74691f6d3789ce551210a4dfd807f 100644 (file)
--- a/drivers/thunderbolt/tmu.c
+++ b/drivers/thunderbolt/tmu.c
@@ -894,7 +894,7 @@ static int tb_switch_tmu_change_mode(struct tb_switch *sw)
 
        ret = tb_switch_set_tmu_mode_params(sw, sw->tmu.mode_request);
        if (ret)
-               return ret;
+               goto out;
 
        /* Program the new mode and the downstream router lane adapter */
        switch (sw->tmu.mode_request) {