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| author |   Qian Cai <cai@lca.pw> | 2020-03-05 15:00:46 -0500 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2020-03-10 10:30:33 +0100 |
| commit | 2d48ea0efb8887ebba3e3720bb5b738aced4e574 (patch) | |
| tree | 7f2a45433c9fe2e38224efa9a6620c428361627b /include/linux | |
| parent | iommu/dma: Fix MSI reservation allocation (diff) | |
| download | linux-dev-2d48ea0efb8887ebba3e3720bb5b738aced4e574.tar.xz linux-dev-2d48ea0efb8887ebba3e3720bb5b738aced4e574.zip | |
iommu/vt-d: Fix RCU-list bugs in intel_iommu_init()
There are several places traverse RCU-list without holding any lock in
intel_iommu_init(). Fix them by acquiring dmar_global_lock.
WARNING: suspicious RCU usage
-----------------------------
drivers/iommu/intel-iommu.c:5216 RCU-list traversed in non-reader section!!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
no locks held by swapper/0/1.
Call Trace:
dump_stack+0xa0/0xea
lockdep_rcu_suspicious+0x102/0x10b
intel_iommu_init+0x947/0xb13
pci_iommu_init+0x26/0x62
do_one_initcall+0xfe/0x500
kernel_init_freeable+0x45a/0x4f8
kernel_init+0x11/0x139
ret_from_fork+0x3a/0x50
DMAR: Intel(R) Virtualization Technology for Directed I/O
Fixes: d8190dc63886 ("iommu/vt-d: Enable DMA remapping after rmrr mapped")
Signed-off-by: Qian Cai <cai@lca.pw>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions