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| author | Joerg Roedel <joerg.roedel@amd.com> | 2009-06-05 12:01:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-07 10:04:53 +0200 |
| commit | 7caf6a49bb17d0377210693af5737563b31aa5ee (patch) | |
| tree | 1a61bc90002bc2e3d1fc5d028e408b35fb765cbd /kernel/sched_clock.c | |
| parent | fe2245c905631a3a353504fc04388ce3dfaf9d9e (diff) | |
| download | linux-7caf6a49bb17d0377210693af5737563b31aa5ee.tar.gz linux-7caf6a49bb17d0377210693af5737563b31aa5ee.tar.bz2 linux-7caf6a49bb17d0377210693af5737563b31aa5ee.zip | |
dma-debug: change hash_bucket_find from first-fit to best-fit
Some device drivers map the same physical address multiple times to a
dma address. Without an IOMMU this results in the same dma address being
put into the dma-debug hash multiple times. With a first-fit match in
hash_bucket_find() this function may return the wrong dma_debug_entry.
This can result in false positive warnings. This patch fixes it by
changing the first-fit behavior of hash_bucket_find() into a best-fit
algorithm.
Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com>
Reported-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: lethal@linux-sh.org
Cc: just.for.lkml@googlemail.com
Cc: hancockrwd@gmail.com
Cc: jens.axboe@oracle.com
Cc: bharrosh@panasas.com
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@kernel.org>
LKML-Reference: <20090605104132.GE24836@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_clock.c')
0 files changed, 0 insertions, 0 deletions