diff mbox series

[v1,2/2] usb: typec: ucsi: Fix role swapping

Message ID 20220405134824.68067-3-heikki.krogerus@linux.intel.com (mailing list archive)
State Accepted
Commit eb5d7ff3cf0d55093c619b5ad107cd5c05ce8134
Headers show
Series usb: typec: ucsi: Role swapping fixes | expand

Commit Message

Heikki Krogerus April 5, 2022, 1:48 p.m. UTC 
All attempts to swap the roles timed out because the
completion was done without releasing the port lock. Fixing
that by releasing the lock before starting to wait for the
completion.

Link: https://lore.kernel.org/linux-usb/037de7ac-e210-bdf5-ec7a-8c0c88a0be20@gmail.com/
Fixes: ad74b8649bea ("usb: typec: ucsi: Preliminary support for alternate modes")
Reported-and-tested-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/usb/typec/ucsi/ucsi.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 576cb0e68596f..a6045aef0d04f 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -958,14 +958,18 @@  static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role)
 	if (ret < 0)
 		goto out_unlock;
 
+	mutex_unlock(&con->lock);
+
 	if (!wait_for_completion_timeout(&con->complete,
-					msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
-		ret = -ETIMEDOUT;
+					 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
+		return -ETIMEDOUT;
+
+	return 0;
 
 out_unlock:
 	mutex_unlock(&con->lock);
 
-	return ret < 0 ? ret : 0;
+	return ret;
 }
 
 static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
@@ -996,11 +1000,13 @@  static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
 	if (ret < 0)
 		goto out_unlock;
 
+	mutex_unlock(&con->lock);
+
 	if (!wait_for_completion_timeout(&con->complete,
-				msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) {
-		ret = -ETIMEDOUT;
-		goto out_unlock;
-	}
+					 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
+		return -ETIMEDOUT;
+
+	mutex_lock(&con->lock);
 
 	/* Something has gone wrong while swapping the role */
 	if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) !=