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| author | Mike Waychison <mikew@google.com> | 2006-04-22 02:36:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-22 09:19:52 -0700 |
| commit | 5b20192727ef2c047343a043ee4fbda67e2beef4 (patch) | |
| tree | 7b0e7e5c1945685ad911add33e0baeb301b9729d /drivers/char/snsc.c | |
| parent | ddbe3eec596fc2c6a513717168217bd19c901880 (diff) | |
| download | linux-5b20192727ef2c047343a043ee4fbda67e2beef4.tar.gz linux-5b20192727ef2c047343a043ee4fbda67e2beef4.tar.bz2 linux-5b20192727ef2c047343a043ee4fbda67e2beef4.zip | |
[PATCH] x86_64: Fix a race in the free_iommu path
We do this by removing a micro-optimization that tries to avoid grabbing
the iommu_bitmap_lock spinlock and using a bus-locked operation.
This still races with other simultaneous alloc_iommu or free_iommu(size >
1) which both use bus-unlocked operations.
The end result of this race is eventually ending up with an
iommu_gart_bitmap that has bits errornously set all over, making large
contiguous iommu space allocations fail with 'PCI-DMA: Out of IOMMU space'.
Signed-off-by: Mike Waychison <mikew@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/snsc.c')
0 files changed, 0 insertions, 0 deletions