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Mon, 24 Jan 2022 22:08:19 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 042EB7806E; Mon, 24 Jan 2022 22:08:18 +0000 (GMT) Received: from farosas.linux.ibm.com.com (unknown [9.163.24.67]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 24 Jan 2022 22:08:17 +0000 (GMT) From: Fabiano Rosas To: kvm-ppc@vger.kernel.org Subject: [PATCH v2 4/4] KVM: PPC: Decrement module refcount if init_vm fails Date: Mon, 24 Jan 2022 19:08:03 -0300 Message-Id: <20220124220803.1011673-5-farosas@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124220803.1011673-1-farosas@linux.ibm.com> References: <20220124220803.1011673-1-farosas@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: nohRpn2q5ZHOVLEtjAAX4HDkT7ejghjw X-Proofpoint-GUID: gFsl5y_F-GZxc6JjT2a-udEA47FyJSNw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-24_09,2022-01-24_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 malwarescore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 priorityscore=1501 spamscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2201240143 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com, aik@ozlabs.ru Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" We increment the reference count for KVM-HV/PR before the call to kvmppc_core_init_vm. If that function fails we need to decrement the refcount. Signed-off-by: Fabiano Rosas Reviewed-by: Nicholas Piggin --- Caught this while testing Nick's LPID patches by looking at /sys/module/kvm_hv/refcnt --- arch/powerpc/kvm/powerpc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 2ad0ccd202d5..4285d0eac900 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -431,6 +431,8 @@ int kvm_arch_check_processor_compat(void *opaque) int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { struct kvmppc_ops *kvm_ops = NULL; + int r; + /* * if we have both HV and PR enabled, default is HV */ @@ -456,7 +458,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) return -ENOENT; kvm->arch.kvm_ops = kvm_ops; - return kvmppc_core_init_vm(kvm); + r = kvmppc_core_init_vm(kvm); + if (r) + module_put(kvm->arch.kvm_ops->owner); + return r; err_out: return -EINVAL; }