linux-kernel - [PATCH] drm/tegra: Add call to put

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Message-Id: <20250919-host1x-put-pid-v1-1-19c2163dfa87@nvidia.com>
Date: Fri, 19 Sep 2025 13:25:40 +0900
From: Mikko Perttunen <mperttunen@...dia.com>
To: Thierry Reding <thierry.reding@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Prateek Agarwal <praagarwal@...dia.com>, 
 Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH] drm/tegra: Add call to put_pid

From: Prateek Agarwal <praagarwal@...dia.com>

Add call to put_pid corresponding to get_task_pid.
host1x_memory_context_alloc does not take ownership of the pid so we
need to free it here to avoid leaking.

Signed-off-by: Prateek Agarwal <praagarwal@...dia.com>
Fixes: e09db97889ec ("drm/tegra: Support context isolation")
[mperttunen@...dia.com: reword commit message]
Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/gpu/drm/tegra/uapi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/uapi.c b/drivers/gpu/drm/tegra/uapi.c
index 5adab6b229164eed6ec1830243ad9f9e5b5147f6..d0b6a1fa6efad9bf945ca6d85c61431f1c2f255f 100644
--- a/drivers/gpu/drm/tegra/uapi.c
+++ b/drivers/gpu/drm/tegra/uapi.c
@@ -114,9 +114,12 @@ int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data, struct drm_
 		if (err)
 			goto put_channel;
 
-		if (supported)
+		if (supported) {
+			struct pid *pid = get_task_pid(current, PIDTYPE_TGID);
 			context->memory_context = host1x_memory_context_alloc(
-				host, client->base.dev, get_task_pid(current, PIDTYPE_TGID));
+				host, client->base.dev, pid);
+			put_pid(pid);
+		}
 
 		if (IS_ERR(context->memory_context)) {
 			if (PTR_ERR(context->memory_context) != -EOPNOTSUPP) {

---
base-commit: ae2d20002576d2893ecaff25db3d7ef9190ac0b6
change-id: 20250918-host1x-put-pid-461d5e9465c8