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| author | Joerg Roedel <jroedel@suse.de> | 2014-07-30 18:04:37 +0400 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2014-07-30 18:07:49 +0400 |
| commit | fcaa96060809224c4d2092e1e0d6efcf0d342bb4 (patch) | |
| tree | 8fb3be362a38db6c038fddc8dd36a01878647304 /drivers/iommu | |
| parent | d9e1611e7347b41bae8894e957a398fa41162dab (diff) | |
| download | linux-fcaa96060809224c4d2092e1e0d6efcf0d342bb4.tar.xz | |
iommu/amd: Don't set pasid_state->mm to NULL in unbind_pasid
With calling te mmu_notifier_register function we hold a
reference to the mm_struct that needs to be released in
mmu_notifier_unregister. This is true even if the notifier
was already unregistered from exit_mmap and the .release
call-back has already run.
So make sure we call mmu_notifier_unregister unconditionally
in amd_iommu_unbind_pasid.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Oded Gabbay <oded.gabbay@amd.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu_v2.c | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index a195c78b63c6..2b7de882e91c 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -320,13 +320,6 @@ static void unbind_pasid(struct pasid_state *pasid_state) /* Make sure no more pending faults are in the queue */ flush_workqueue(iommu_wq); - - /* - * No more faults are in the work queue and no new faults will be queued - * from here on. We can safely set pasid_state->mm to NULL now as the - * mm_struct might go away after we return. - */ - pasid_state->mm = NULL; } static void free_pasid_states_level1(struct pasid_state **tbl) @@ -756,17 +749,10 @@ void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid) clear_pasid_state(dev_state, pasid_state->pasid); /* - * Check if pasid_state->mm is still valid. If mn_release has already - * run it will be NULL and we can't (and don't need to) call - * mmu_notifier_unregister() on it anymore. + * Call mmu_notifier_unregister to drop our reference + * to pasid_state->mm */ - if (pasid_state->mm) { - /* - * This will call the mn_release function and unbind - * the PASID. - */ - mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); - } + mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm); put_pasid_state_wait(pasid_state); /* Reference taken in amd_iommu_pasid_bind */ |