[PATCH v2] slimbus: messaging: fix leaked PM vote on tid allocation failure

[Zongmin Zhou <min_halo@163.com>]

From: Zongmin Zhou <zhouzongmin@kylinos.cn>

In slim_do_transfer(), when a transaction needs a tid and
slim_alloc_txn_tid() fails, the function returns directly instead of
jumping to slim_xfer_err. The runtime PM vote taken earlier with
pm_runtime_get_sync() is then never released, leaving the controller
permanently powered up.

As txn->tid is still 0 at that point, jumping to slim_xfer_err drops
the vote exactly like it is done for other failed transactions.

Fixes: d3062a2109309 ("slimbus: messaging: add slim_alloc/free_txn_tid()")
Cc: stable@vger.kernel.org
Signed-off-by: Zongmin Zhou <zhouzongmin@kylinos.cn>
---
Changes in v2:
- Add Cc: stable@vger.kernel.org as suggested by Srinivas.

 drivers/slimbus/messaging.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c
index e2dbe4a66b70..ee127ef42046 100644
--- a/drivers/slimbus/messaging.c
+++ b/drivers/slimbus/messaging.c
@@ -139,7 +139,7 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
 	if (need_tid) {
 		ret = slim_alloc_txn_tid(ctrl, txn);
 		if (ret)
-			return ret;
+			goto slim_xfer_err;
 
 		if (!txn->msg->comp)
 			txn->comp = &done;
-- 
2.34.1


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