From: Jason Gunthorpe <jgg@nvidia.com>
Date: Thu, 7 Dec 2023 18:03:11 +0000 (-0400)
Subject: iommu: Mark dev_iommu_get() with lockdep
X-Git-Tag: v6.8-rc1~49^2^8~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64945d1b0ed169aeffa59020941e4ac45ebc315a;p=thirdparty%2Fkernel%2Flinux.git

iommu: Mark dev_iommu_get() with lockdep

Allocation of dev->iommu must be done under the
iommu_probe_device_lock. Mark this with lockdep to discourage future
mistakes.

Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Tested-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Moritz Fischer <moritzf@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/4-v2-16e4def25ebb+820-iommu_fwspec_p1_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d0a28667479a8..df58025c001b3 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -334,6 +334,8 @@ static struct dev_iommu *dev_iommu_get(struct device *dev)
 {
 	struct dev_iommu *param = dev->iommu;
 
+	lockdep_assert_held(&iommu_probe_device_lock);
+
 	if (param)
 		return param;