vdpa/mlx5: Fix error path during device add
In the error recovery path of mlx5_vdpa_dev_add(), the cleanup is
executed and at the end put_device() is called which ends up calling
mlx5_vdpa_free(). This function will execute the same cleanup all over
again. Most resources support being cleaned up twice, but the recent
mlx5_vdpa_destroy_mr_resources() doesn't.
This change drops the explicit cleanup from within the
mlx5_vdpa_dev_add() and lets mlx5_vdpa_free() do its work.
This issue was discovered while trying to add 2 vdpa devices with the
same name:
$> vdpa dev add name vdpa-0 mgmtdev auxiliary/mlx5_core.sf.2
$> vdpa dev add name vdpa-0 mgmtdev auxiliary/mlx5_core.sf.3
... yields the following dump:
BUG: kernel NULL pointer dereference, address: 00000000000000b8
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: Oops: 0000 [#1] SMP
CPU: 4 UID: 0 PID: 2811 Comm: vdpa Not tainted 6.12.0-rc6 #1
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
RIP: 0010:destroy_workqueue+0xe/0x2a0
Code: ...
RSP: 0018:ffff88814920b9a8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888105c10000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff888100400168 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888100120c00 R09: ffffffff828578c0
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888131fd99a0 R14: 0000000000000000 R15: ffff888105c10580
FS: 00007fdfa6b4f740(0000) GS:ffff88852ca00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b8 CR3: 000000018db09006 CR4: 0000000000372eb0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
? __die+0x20/0x60
? page_fault_oops+0x150/0x3e0
? exc_page_fault+0x74/0x130
? asm_exc_page_fault+0x22/0x30
? destroy_workqueue+0xe/0x2a0
mlx5_vdpa_destroy_mr_resources+0x2b/0x40 [mlx5_vdpa]
mlx5_vdpa_free+0x45/0x150 [mlx5_vdpa]
vdpa_release_dev+0x1e/0x50 [vdpa]
device_release+0x31/0x90
kobject_put+0x8d/0x230
mlx5_vdpa_dev_add+0x328/0x8b0 [mlx5_vdpa]
vdpa_nl_cmd_dev_add_set_doit+0x2b8/0x4c0 [vdpa]
genl_family_rcv_msg_doit+0xd0/0x120
genl_rcv_msg+0x180/0x2b0
? __vdpa_alloc_device+0x1b0/0x1b0 [vdpa]
? genl_family_rcv_msg_dumpit+0xf0/0xf0
netlink_rcv_skb+0x54/0x100
genl_rcv+0x24/0x40
netlink_unicast+0x1fc/0x2d0
netlink_sendmsg+0x1e4/0x410
__sock_sendmsg+0x38/0x60
? sockfd_lookup_light+0x12/0x60
__sys_sendto+0x105/0x160
? __count_memcg_events+0x53/0xe0
? handle_mm_fault+0x100/0x220
? do_user_addr_fault+0x40d/0x620
__x64_sys_sendto+0x20/0x30
do_syscall_64+0x4c/0x100
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7fdfa6c66b57
Code: ...
RSP: 002b:00007ffeace22998 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055a498608350 RCX: 00007fdfa6c66b57
RDX: 000000000000006c RSI: 000055a498608350 RDI: 0000000000000003
RBP: 00007ffeace229c0 R08: 00007fdfa6d35200 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 000055a4986082a0
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffeace233f3
</TASK>
Modules linked in: ...
CR2: 00000000000000b8
Fixes: 6211165448
("vdpa/mlx5: Postpone MR deletion")
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Message-Id: <20241105185101.1323272-2-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
This commit is contained in:
parent
4e39ecadf1
commit
83e445e64f
@ -3963,28 +3963,28 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
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mvdev->vdev.dma_dev = &mdev->pdev->dev;
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err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
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if (err)
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goto err_mpfs;
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goto err_alloc;
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err = mlx5_vdpa_init_mr_resources(mvdev);
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if (err)
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goto err_res;
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goto err_alloc;
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if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
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err = mlx5_vdpa_create_dma_mr(mvdev);
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if (err)
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goto err_mr_res;
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goto err_alloc;
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}
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err = alloc_fixed_resources(ndev);
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if (err)
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goto err_mr;
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goto err_alloc;
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ndev->cvq_ent.mvdev = mvdev;
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INIT_WORK(&ndev->cvq_ent.work, mlx5_cvq_kick_handler);
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mvdev->wq = create_singlethread_workqueue("mlx5_vdpa_wq");
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if (!mvdev->wq) {
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err = -ENOMEM;
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goto err_res2;
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goto err_alloc;
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}
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mvdev->vdev.mdev = &mgtdev->mgtdev;
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@ -4010,17 +4010,6 @@ err_setup_vq_res:
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_vdpa_unregister_device(&mvdev->vdev);
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err_reg:
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destroy_workqueue(mvdev->wq);
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err_res2:
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free_fixed_resources(ndev);
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err_mr:
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mlx5_vdpa_clean_mrs(mvdev);
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err_mr_res:
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mlx5_vdpa_destroy_mr_resources(mvdev);
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err_res:
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mlx5_vdpa_free_resources(&ndev->mvdev);
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err_mpfs:
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if (!is_zero_ether_addr(config->mac))
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mlx5_mpfs_del_mac(pfmdev, config->mac);
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err_alloc:
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put_device(&mvdev->vdev.dev);
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return err;
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