From: Viresh Kumar Date: Thu, 3 Jul 2025 11:31:02 +0000 (+0530) Subject: i2c: virtio: Avoid hang by using interruptible completion wait X-Git-Tag: v6.16~3^2^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a663b3c47ab10f66130818cf94eb59c971541c3f;p=thirdparty%2Fkernel%2Fstable.git 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. Fixes: 84e1d0bf1d71 ("i2c: virtio: disable timeout handling") Signed-off-by: Viresh Kumar Cc: # v5.16+ Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/b8944e9cab8eb959d888ae80add6f2a686159ba2.1751541962.git.viresh.kumar@linaro.org --- diff --git a/drivers/i2c/busses/i2c-virtio.c b/drivers/i2c/busses/i2c-virtio.c index 9b05ff53d3d72..af1381949f50c 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;