linux-kernel - RE: [PATCH 1/1] iommu/vt-d: Fix possible recursive locking in intel_iommu

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Message-ID: <BN9PR11MB5276287E75395A59865812978C919@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 21 Jul 2022 07:39:20 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] iommu/vt-d: Fix possible recursive locking in
 intel_iommu_init()

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, July 19, 2022 7:53 AM
> 
> @@ -88,7 +89,8 @@ extern struct list_head dmar_drhd_units;
>  static inline bool dmar_rcu_check(void)
>  {
>  	return rwsem_is_locked(&dmar_global_lock) ||
> -	       system_state == SYSTEM_BOOTING;
> +	       system_state == SYSTEM_BOOTING ||
> +	       (IS_ENABLED(CONFIG_INTEL_IOMMU)
> && !intel_iommu_enabled);
>  }

intel_iommu_enabled is 0 if CONFIG_INTEL_IOMMU is not set.

same for other similar checks.