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Date: Mon, 23 May 2022 12:26:54 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: Julia Lawall <julia.lawall@...ia.fr>
Cc: Gautam Dawar <gautam.dawar@...inx.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
kbuild-all@...ts.01.org
Subject: Re: [mst-vhost:vhost 26/43] drivers/vhost/vdpa.c:1003:3-9: preceding
lock on line 991 (fwd)
On Fri, May 20, 2022 at 06:37:01PM +0200, Julia Lawall wrote:
>Please check whether an unlock is needed before line 1003.
Yep, I think so. Same also for line 1016.
I just saw that there is already a patch posted to solve this problem:
https://lore.kernel.org/netdev/89ef0ae4c26ac3cfa440c71e97e392dcb328ac1b.1653227924.git.christophe.jaillet@wanadoo.fr/
Thanks for the report,
Stefano
>
>julia
>
>---------- Forwarded message ----------
>Date: Fri, 20 May 2022 17:35:29 +0800
>From: kernel test robot <lkp@...el.com>
>To: kbuild@...ts.01.org
>Cc: lkp@...el.com, Julia Lawall <julia.lawall@...6.fr>
>Subject: [mst-vhost:vhost 26/43] drivers/vhost/vdpa.c:1003:3-9: preceding lock
> on line 991
>
>CC: kbuild-all@...ts.01.org
>BCC: lkp@...el.com
>CC: kvm@...r.kernel.org
>CC: virtualization@...ts.linux-foundation.org
>CC: netdev@...r.kernel.org
>TO: Gautam Dawar <gautam.dawar@...inx.com>
>CC: "Michael S. Tsirkin" <mst@...hat.com>
>CC: Jason Wang <jasowang@...hat.com>
>
>tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost
>head: 73211bf1bc3ac0a3c544225e270401c1fe5d395d
>commit: a1468175bb17ca5e477147de5d886e7a22d93527 [26/43] vhost-vdpa: support ASID based IOTLB API
>:::::: branch date: 10 hours ago
>:::::: commit date: 10 hours ago
>config: arc-allmodconfig (https://download.01.org/0day-ci/archive/20220520/202205201721.rGqusahl-lkp@intel.com/config)
>compiler: arceb-elf-gcc (GCC) 11.3.0
>
>If you fix the issue, kindly add following tag as appropriate
>Reported-by: kernel test robot <lkp@...el.com>
>Reported-by: Julia Lawall <julia.lawall@...6.fr>
>
>
>cocci warnings: (new ones prefixed by >>)
>>> drivers/vhost/vdpa.c:1003:3-9: preceding lock on line 991
> drivers/vhost/vdpa.c:1016:2-8: preceding lock on line 991
>
>vim +1003 drivers/vhost/vdpa.c
>
>4c8cf31885f69e Tiwei Bie 2020-03-26 980
>0f05062453fb51 Gautam Dawar 2022-03-30 981 static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, u32 asid,
>4c8cf31885f69e Tiwei Bie 2020-03-26 982 struct vhost_iotlb_msg *msg)
>4c8cf31885f69e Tiwei Bie 2020-03-26 983 {
>4c8cf31885f69e Tiwei Bie 2020-03-26 984 struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
>25abc060d28213 Jason Wang 2020-08-04 985 struct vdpa_device *vdpa = v->vdpa;
>25abc060d28213 Jason Wang 2020-08-04 986 const struct vdpa_config_ops *ops = vdpa->config;
>a1468175bb17ca Gautam Dawar 2022-03-30 987 struct vhost_iotlb *iotlb = NULL;
>a1468175bb17ca Gautam Dawar 2022-03-30 988 struct vhost_vdpa_as *as = NULL;
>4c8cf31885f69e Tiwei Bie 2020-03-26 989 int r = 0;
>4c8cf31885f69e Tiwei Bie 2020-03-26 990
>a9d064524fc3cf Xie Yongji 2021-04-12 @991 mutex_lock(&dev->mutex);
>a9d064524fc3cf Xie Yongji 2021-04-12 992
>4c8cf31885f69e Tiwei Bie 2020-03-26 993 r = vhost_dev_check_owner(dev);
>4c8cf31885f69e Tiwei Bie 2020-03-26 994 if (r)
>a9d064524fc3cf Xie Yongji 2021-04-12 995 goto unlock;
>4c8cf31885f69e Tiwei Bie 2020-03-26 996
>a1468175bb17ca Gautam Dawar 2022-03-30 997 if (msg->type == VHOST_IOTLB_UPDATE ||
>a1468175bb17ca Gautam Dawar 2022-03-30 998 msg->type == VHOST_IOTLB_BATCH_BEGIN) {
>a1468175bb17ca Gautam Dawar 2022-03-30 999 as = vhost_vdpa_find_alloc_as(v, asid);
>a1468175bb17ca Gautam Dawar 2022-03-30 1000 if (!as) {
>a1468175bb17ca Gautam Dawar 2022-03-30 1001 dev_err(&v->dev, "can't find and alloc asid %d\n",
>a1468175bb17ca Gautam Dawar 2022-03-30 1002 asid);
>a1468175bb17ca Gautam Dawar 2022-03-30 @1003 return -EINVAL;
>a1468175bb17ca Gautam Dawar 2022-03-30 1004 }
>a1468175bb17ca Gautam Dawar 2022-03-30 1005 iotlb = &as->iotlb;
>a1468175bb17ca Gautam Dawar 2022-03-30 1006 } else
>a1468175bb17ca Gautam Dawar 2022-03-30 1007 iotlb = asid_to_iotlb(v, asid);
>a1468175bb17ca Gautam Dawar 2022-03-30 1008
>a1468175bb17ca Gautam Dawar 2022-03-30 1009 if ((v->in_batch && v->batch_asid != asid) || !iotlb) {
>a1468175bb17ca Gautam Dawar 2022-03-30 1010 if (v->in_batch
>&& v->batch_asid != asid) {
>a1468175bb17ca Gautam Dawar 2022-03-30 1011 dev_info(&v->dev, "batch id %d asid %d\n",
>a1468175bb17ca Gautam Dawar 2022-03-30 1012 v->batch_asid, asid);
>a1468175bb17ca Gautam Dawar 2022-03-30 1013 }
>a1468175bb17ca Gautam Dawar 2022-03-30 1014 if (!iotlb)
>a1468175bb17ca Gautam Dawar 2022-03-30 1015 dev_err(&v->dev, "no iotlb for asid %d\n", asid);
>a1468175bb17ca Gautam Dawar 2022-03-30 1016 return -EINVAL;
>a1468175bb17ca Gautam Dawar 2022-03-30 1017 }
>a1468175bb17ca Gautam Dawar 2022-03-30 1018
>4c8cf31885f69e Tiwei Bie 2020-03-26 1019 switch (msg->type) {
>4c8cf31885f69e Tiwei Bie 2020-03-26 1020 case VHOST_IOTLB_UPDATE:
>3111cb7283065a Gautam Dawar 2022-03-30 1021 r = vhost_vdpa_process_iotlb_update(v, iotlb, msg);
>4c8cf31885f69e Tiwei Bie 2020-03-26 1022 break;
>4c8cf31885f69e Tiwei Bie 2020-03-26 1023 case VHOST_IOTLB_INVALIDATE:
>3111cb7283065a Gautam Dawar 2022-03-30 1024 vhost_vdpa_unmap(v, iotlb, msg->iova, msg->size);
>4c8cf31885f69e Tiwei Bie 2020-03-26 1025 break;
>25abc060d28213 Jason Wang 2020-08-04 1026 case VHOST_IOTLB_BATCH_BEGIN:
>a1468175bb17ca Gautam Dawar 2022-03-30 1027 v->batch_asid = asid;
>25abc060d28213 Jason Wang 2020-08-04 1028 v->in_batch = true;
>25abc060d28213 Jason Wang 2020-08-04 1029 break;
>25abc060d28213 Jason Wang 2020-08-04 1030 case VHOST_IOTLB_BATCH_END:
>25abc060d28213 Jason Wang 2020-08-04 1031 if (v->in_batch && ops->set_map)
>a1468175bb17ca Gautam Dawar 2022-03-30 1032 ops->set_map(vdpa, asid, iotlb);
>25abc060d28213 Jason Wang 2020-08-04 1033 v->in_batch = false;
>a1468175bb17ca Gautam Dawar 2022-03-30 1034 if (!iotlb->nmaps)
>a1468175bb17ca Gautam Dawar 2022-03-30 1035 vhost_vdpa_remove_as(v, asid);
>25abc060d28213 Jason Wang 2020-08-04 1036 break;
>4c8cf31885f69e Tiwei Bie 2020-03-26 1037 default:
>4c8cf31885f69e Tiwei Bie 2020-03-26 1038 r = -EINVAL;
>4c8cf31885f69e Tiwei Bie 2020-03-26 1039 break;
>4c8cf31885f69e Tiwei Bie 2020-03-26 1040 }
>a9d064524fc3cf Xie Yongji 2021-04-12 1041 unlock:
>a9d064524fc3cf Xie Yongji 2021-04-12 1042 mutex_unlock(&dev->mutex);
>4c8cf31885f69e Tiwei Bie 2020-03-26 1043
>4c8cf31885f69e Tiwei Bie 2020-03-26 1044 return r;
>4c8cf31885f69e Tiwei Bie 2020-03-26 1045 }
>4c8cf31885f69e Tiwei Bie 2020-03-26 1046
>
>--
>0-DAY CI Kernel Test Service
>https://01.org/lkp
>
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