linux-kernel - [PATCH] i2c: virtio: Avoid hang by using interruptible completion wait

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Message-Id: <b8944e9cab8eb959d888ae80add6f2a686159ba2.1751541962.git.viresh.kumar@linaro.org>
Date: Thu,  3 Jul 2025 17:01:02 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Viresh Kumar <viresh.kumar@...aro.org>,
	"Chen, Jian Jun" <jian.jun.chen@...el.com>,
	Andi Shyti <andi.shyti@...nel.org>
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
	linux-i2c@...r.kernel.org,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: virtio: Avoid hang by using interruptible completion wait

The current implementation uses wait_for_completion(), which can cause
the caller to hang indefinitely if the transfer never completes.

Switch to wait_for_completion_interruptible() so that the operation can
be interrupted by signals.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/i2c/busses/i2c-virtio.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-virtio.c b/drivers/i2c/busses/i2c-virtio.c
index 2a351f961b89..c8c40ff9765d 100644
--- a/drivers/i2c/busses/i2c-virtio.c
+++ b/drivers/i2c/busses/i2c-virtio.c
@@ -116,15 +116,16 @@ static int virtio_i2c_complete_reqs(struct virtqueue *vq,
 	for (i = 0; i < num; i++) {
 		struct virtio_i2c_req *req = &reqs[i];
 
-		wait_for_completion(&req->completion);
-
-		if (!failed && req->in_hdr.status != VIRTIO_I2C_MSG_OK)
-			failed = true;
+		if (!failed) {
+			if (wait_for_completion_interruptible(&req->completion))
+				failed = true;
+			else if (req->in_hdr.status != VIRTIO_I2C_MSG_OK)
+				failed = true;
+			else
+				j++;
+		}
 
 		i2c_put_dma_safe_msg_buf(reqs[i].buf, &msgs[i], !failed);
-
-		if (!failed)
-			j++;
 	}
 
 	return j;
-- 
2.31.1.272.g89b43f80a514