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Fri, 25 Sep 2026 19:01:05 +0000 (GMT) Received: from d (unknown [9.16.59.154]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTPS; Fri, 25 Sep 2026 19:01:04 +0000 (GMT) From: Dave Marquardt To: Mingming Cao Cc: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org, horms@kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, nnac123@linux.ibm.com, maddy@linux.ibm.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, bjking1@linux.ibm.com, shaik.abdulla1@ibm.com, stable@vger.kernel.org Subject: Re: [PATCH net 1/2] ibmveth: h_free logical LAN on open-fail after register In-Reply-To: <7a56fbfb9e0674f011f4e310fbd7dfd8e67c30aa.1790357373.git.mmc@linux.ibm.com> (Mingming Cao's message of "Fri, 25 Sep 2026 11:05:29 -0700") References: <7a56fbfb9e0674f011f4e310fbd7dfd8e67c30aa.1790357373.git.mmc@linux.ibm.com> Date: Fri, 25 Sep 2026 14:01:04 -0500 Message-ID: <87jyo917gv.fsf@linux.ibm.com> User-Agent: Gnus/5.13 (Gnus v5.13) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: IoX1rp9zmChx61FOk3tzdZ8-hN9d_gfH X-Authority-Analysis: v=2.4 cv=I43w19gg c=1 sm=1 tr=0 ts=6ab6c4f5 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=VwQbUJbxAAAA:8 a=Upk1lBxnHq3MJdZ7FDEA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI1MDA3NCBTYWx0ZWRfXywonysU5zfCl 0sykjRxg7qtMqIiYwklJKwSB/MpbN3jYfpMgms8Y9O46lfmVAzd9AvQOX7Qi5hvzb8rtobPB3ES W2x+Oa0XoeaXspujRvYlAEgGiCOXlgFLCQS3uAMEB/WDHfupxkUToiO9Wbz4N05OBEaLV3svru5 uzwSzgcG5oyNw3JlwS7mSUv/0WYmSJYjkuxNYfbCls5YDOflHacMnqbxi9n6/3fKfVwX6AQSZ/H sYUorrPZdgyQgkV3brzpXQxLyOwxKClgr9t2HYERLtlEnq7a408PEeortIQAcCLCpDICp08USMD 17UzD5QhcVxViMTlP8dq7x5hMmG47TkZKYTyatOSRcIuCnSJYbYBeEFbBufiOj9dQeB63tfjfbT 01yzuMOKKRvIS5mXhNVELm+/dt7yGccsXLsgv5XZ105XDxGNHR+kb+ckYfvmrkrS3L56LxHs10j bPP9yJ03ph/lCG+1YBA== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI1MDA3NCBTYWx0ZWRfX7mB07K0ioE+s sLP3T0Mg8xAn+oCArh1x3YiyFYzUSgBXQY8DFL8Px0KCsn7IEFY/RCCKpVbWQdlbvxMXXA8vxFu yA3BbCvE/GL/yAbEu80yD/nuDTgqCy4= X-Proofpoint-GUID: qHkBE4jgKkgIzDOukAyAkToDtDL2AHj0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-25_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1011 adultscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609250074 Mingming Cao writes: > ibmveth_open() registers the logical LAN, then allocates the RX > buffer pools. A pool failure jumps to out_free_buffer_pools without > h_free_logical_lan(), so PHYP still owns the buffer-list page when > it is unmapped. request_irq() failure already issued the hypercall > before taking the same label. > > Move that h_free to the shared post-register unwind so both paths > deregister before the buffer list is unmapped. > > Fixes: d43732ce021f ("ibmveth: properly unwind on init errors") > Cc: stable@vger.kernel.org > Signed-off-by: Mingming Cao > --- > drivers/net/ethernet/ibm/ibmveth.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c > index 73e051d26b9d..3e44f6b714d4 100644 > --- a/drivers/net/ethernet/ibm/ibmveth.c > +++ b/drivers/net/ethernet/ibm/ibmveth.c > @@ -718,10 +718,6 @@ static int ibmveth_open(struct net_device *netdev) > if (rc != 0) { > netdev_err(netdev, "unable to request irq 0x%x, rc %d\n", > netdev->irq, rc); > - do { > - lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); > - } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); > - > goto out_free_buffer_pools; > } This code change is good. But I noticed another thing that's a pretty minor bug of useless code just after this: rc = -ENOMEM; rc isn't used in that code path after it is set. Is there some reason I do not understand to have this here? > @@ -737,6 +733,9 @@ static int ibmveth_open(struct net_device *netdev) > return 0; > > out_free_buffer_pools: > + do { > + lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); > + } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); > while (--i >= 0) { > if (adapter->rx_buff_pool[i].active) > ibmveth_free_buffer_pool(adapter, Reviewed-by: Dave Marquardt