[luxis1999-iommufd:iommufd-v5.17-rc6 24/28] drivers/iommu/iommufd/vfio_compat.c:494:2-8: preceding lock on line 491

[luxis1999-iommufd:iommufd-v5.17-rc6 24/28] drivers/iommu/iommufd/vfio_compat.c:494:2-8: preceding lock on line 491

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
TO: Liu Yi L <yi.l.liu@intel.com>

tree:   https://github.com/luxis1999/iommufd iommufd-v5.17-rc6
head:   71a58479a11e89a480ebc59ed5163440d3e2772c
commit: a3273f1f88fe60e784d6e9916269a7d70fc6daf4 [24/28] iommufd: Add vfio_group_set/unset_iommufd helpers
:::::: branch date: 2 days ago
:::::: commit date: 4 weeks ago
config: sparc64-randconfig-c024-20220414 (https://download.01.org/0day-ci/archive/20220415/202204151332.VXctgcaF-lkp(a)intel.com/config)
compiler: sparc64-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>


cocci warnings: (new ones prefixed by >>)
>> drivers/iommu/iommufd/vfio_compat.c:494:2-8: preceding lock on line 491

vim +494 drivers/iommu/iommufd/vfio_compat.c

a3273f1f88fe60 Nicolin Chen 2022-01-31  481  
a3273f1f88fe60 Nicolin Chen 2022-01-31  482  void vfio_group_unset_iommufd(void *iommufd, struct list_head *device_list)
a3273f1f88fe60 Nicolin Chen 2022-01-31  483  {
a3273f1f88fe60 Nicolin Chen 2022-01-31  484  	struct iommufd_ctx *ictx = (struct iommufd_ctx *)iommufd;
a3273f1f88fe60 Nicolin Chen 2022-01-31  485  	struct iommufd_ioas *ioas;
a3273f1f88fe60 Nicolin Chen 2022-01-31  486  	struct vfio_device *device;
a3273f1f88fe60 Nicolin Chen 2022-01-31  487  	unsigned int ioas_id;
a3273f1f88fe60 Nicolin Chen 2022-01-31  488  
a3273f1f88fe60 Nicolin Chen 2022-01-31  489  	if (!ictx)
a3273f1f88fe60 Nicolin Chen 2022-01-31  490  		return;
a3273f1f88fe60 Nicolin Chen 2022-01-31 @491  	mutex_lock(&ictx->vfio_compat);
a3273f1f88fe60 Nicolin Chen 2022-01-31  492  	ioas = get_compat_ioas(ictx);
a3273f1f88fe60 Nicolin Chen 2022-01-31  493  	if (IS_ERR(ioas))
a3273f1f88fe60 Nicolin Chen 2022-01-31 @494  		return;

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