diff options
| author | Gerd Rausch <gerd.rausch@oracle.com> | 2021-08-17 10:04:37 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-08-18 15:35:50 -0700 |
| commit | fb4b1373dcab086d0619c29310f0466a0b2ceb8a (patch) | |
| tree | 0a8689b6c5ad58ba5fc7dcaa608d24b66cba51d3 /net/mptcp | |
| parent | c1930148a3941f891ddbd76fceaa4e10a957ccf2 (diff) | |
net/rds: dma_map_sg is entitled to merge entries
Function "dma_map_sg" is entitled to merge adjacent entries
and return a value smaller than what was passed as "nents".
Subsequently "ib_map_mr_sg" needs to work with this value ("sg_dma_len")
rather than the original "nents" parameter ("sg_len").
This old RDS bug was exposed and reliably causes kernel panics
(using RDMA operations "rds-stress -D") on x86_64 starting with:
commit c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
Simply put: Linux 5.11 and later.
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Link: https://lore.kernel.org/r/60efc69f-1f35-529d-a7ef-da0549cad143@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp')
0 files changed, 0 insertions, 0 deletions