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Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , Simon Horman , Hemant Kumar , Loic Poulain , Maxim Kochetkov CC: Manivannan Sadhasivam , Bjorn Andersson , , , , Bhaumik Bhatt , Johan Hovold , Chris Lew X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1730770225; l=2100; i=quic_clew@quicinc.com; s=20240508; h=from:subject:message-id; bh=l/2R1bFTH1P6r02ldFAB/Su/VVR10tVU+0qSK5qySvM=; b=/79qRr0F+lIQoeAb9KFZVcP4ODBJoBFOJEnNVYG0fXfeumbmctYkOXfAuodPxupRM7paHl2H7 3Vq79Y84drZDxrM+MFvjaLZYLCYgE7aUYfDedZWwxDQEI8oVSs9Ns+G X-Developer-Key: i=quic_clew@quicinc.com; a=ed25519; pk=lEYKFaL1H5dMC33BEeOULLcHAwjKyHkTLdLZQRDTKV4= X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: wp-EMW0fy4hDk3Pfut9U-pAFgIahto6M X-Proofpoint-ORIG-GUID: wp-EMW0fy4hDk3Pfut9U-pAFgIahto6M X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 malwarescore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 priorityscore=1501 mlxlogscore=816 impostorscore=0 suspectscore=0 spamscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411050010 X-Patchwork-Delegate: kuba@kernel.org From: Bhaumik Bhatt The call to qrtr_endpoint_register() was moved before mhi_prepare_for_transfer_autoqueue() to prevent a case where a dl callback can occur before the qrtr endpoint is registered. Now the reverse can happen where qrtr will try to send a packet before the channels are prepared. Add a wait in the sending path to ensure the channels are prepared before trying to do a ul transfer. Fixes: 68a838b84eff ("net: qrtr: start MHI channel after endpoit creation") Reported-by: Johan Hovold Closes: https://lore.kernel.org/linux-arm-msm/ZyTtVdkCCES0lkl4@hovoldconsulting.com/ Signed-off-by: Bhaumik Bhatt Signed-off-by: Chris Lew --- net/qrtr/mhi.c | 7 +++++++ 1 file changed, 7 insertions(+) --- base-commit: 1ffec08567f426a1c593e038cadc61bdc38cb467 change-id: 20241104-qrtr_mhi-dfec353030af Best regards, diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c index 69f53625a049..5b7268868bbd 100644 --- a/net/qrtr/mhi.c +++ b/net/qrtr/mhi.c @@ -15,6 +15,7 @@ struct qrtr_mhi_dev { struct qrtr_endpoint ep; struct mhi_device *mhi_dev; struct device *dev; + struct completion prepared; }; /* From MHI to QRTR */ @@ -53,6 +54,10 @@ static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb) if (skb->sk) sock_hold(skb->sk); + rc = wait_for_completion_interruptible(&qdev->prepared); + if (rc) + goto free_skb; + rc = skb_linearize(skb); if (rc) goto free_skb; @@ -85,6 +90,7 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, qdev->mhi_dev = mhi_dev; qdev->dev = &mhi_dev->dev; qdev->ep.xmit = qcom_mhi_qrtr_send; + init_completion(&qdev->prepared); dev_set_drvdata(&mhi_dev->dev, qdev); rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO); @@ -97,6 +103,7 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, qrtr_endpoint_unregister(&qdev->ep); return rc; } + complete_all(&qdev->prepared); dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n");